diff --git a/app/package-lock.json b/app/package-lock.json
index 74ff3e5e504a0d242f53681593e170f1abfe103e..8b22c3c4282c99e16a8f03ed2da0b7927226373c 100644
--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -16,6 +16,7 @@
         "@yume-chan/stream-extra": "1.0.0",
         "@yume-chan/struct": "1.0.0",
         "@zip.js/zip.js": "^2.7.54",
+        "hash-wasm": "^4.11.0",
         "ky": "^1.7.4"
       },
       "devDependencies": {
@@ -36,6 +37,278 @@
         "pako": "^2.1.0"
       }
     },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.24.2.tgz",
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+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.24.2.tgz",
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+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
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+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
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+      }
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+        "freebsd"
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+        "linux"
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+        "ia32"
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+        "linux"
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+      "engines": {
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.24.2.tgz",
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+        "loong64"
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+      "license": "MIT",
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+        "linux"
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.24.2.tgz",
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+      "cpu": [
+        "mips64el"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-ppc64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.24.2.tgz",
+      "integrity": "sha512-shsVrgCZ57Vr2L8mm39kO5PPIb+843FStGt7sGGoqiiWYconSxwTiuswC1VJZLCjNiMLAMh34jg4VSEQb+iEbw==",
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+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-riscv64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.24.2.tgz",
+      "integrity": "sha512-4eSFWnU9Hhd68fW16GD0TINewo1L6dRrB+oLNNbYyMUAeOD2yCK5KXGK1GH4qD/kT+bTEXjsyTCiJGHPZ3eM9Q==",
+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-s390x": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.24.2.tgz",
+      "integrity": "sha512-S0Bh0A53b0YHL2XEXC20bHLuGMOhFDO6GN4b3YjRLK//Ep3ql3erpNcPlEFed93hsQAjAQDNsvcK+hV90FubSw==",
+      "cpu": [
+        "s390x"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/linux-x64": {
       "version": "0.24.2",
       "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.24.2.tgz",
@@ -53,6 +326,142 @@
         "node": ">=18"
       }
     },
+    "node_modules/@esbuild/netbsd-arm64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.24.2.tgz",
+      "integrity": "sha512-wuLK/VztRRpMt9zyHSazyCVdCXlpHkKm34WUyinD2lzK07FAHTq0KQvZZlXikNWkDGoT6x3TD51jKQ7gMVpopw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "netbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/netbsd-x64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.24.2.tgz",
+      "integrity": "sha512-VefFaQUc4FMmJuAxmIHgUmfNiLXY438XrL4GDNV1Y1H/RW3qow68xTwjZKfj/+Plp9NANmzbH5R40Meudu8mmw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "netbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/openbsd-arm64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-arm64/-/openbsd-arm64-0.24.2.tgz",
+      "integrity": "sha512-YQbi46SBct6iKnszhSvdluqDmxCJA+Pu280Av9WICNwQmMxV7nLRHZfjQzwbPs3jeWnuAhE9Jy0NrnJ12Oz+0A==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/openbsd-x64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.24.2.tgz",
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+        "x64"
+      ],
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+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/sunos-x64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.24.2.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "sunos"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-arm64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.24.2.tgz",
+      "integrity": "sha512-LihEQ2BBKVFLOC9ZItT9iFprsE9tqjDjnbulhHoFxYQtQfai7qfluVODIYxt1PgdoyQkz23+01rzwNwYfutxUQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-ia32": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.24.2.tgz",
+      "integrity": "sha512-q+iGUwfs8tncmFC9pcnD5IvRHAzmbwQ3GPS5/ceCyHdjXubwQWI12MKWSNSMYLJMq23/IUCvJMS76PDqXe1fxA==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-x64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.24.2.tgz",
+      "integrity": "sha512-7VTgWzgMGvup6aSqDPLiW5zHaxYJGTO4OokMjIlrCtf+VpEL+cXKtCvg723iguPYI5oaUNdS+/V7OU2gvXVWEg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.1.tgz",
@@ -297,6 +706,202 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@rollup/rollup-android-arm-eabi": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.29.1.tgz",
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+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ]
+    },
+    "node_modules/@rollup/rollup-android-arm64": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.29.1.tgz",
+      "integrity": "sha512-CaRfrV0cd+NIIcVVN/jx+hVLN+VRqnuzLRmfmlzpOzB87ajixsN/+9L5xNmkaUUvEbI5BmIKS+XTwXsHEb65Ew==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ]
+    },
+    "node_modules/@rollup/rollup-darwin-arm64": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-arm64/-/rollup-darwin-arm64-4.29.1.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ]
+    },
+    "node_modules/@rollup/rollup-darwin-x64": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-x64/-/rollup-darwin-x64-4.29.1.tgz",
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+      "license": "MIT",
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+      "license": "MIT",
+      "optional": true,
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ]
+    },
+    "node_modules/@rollup/rollup-linux-arm-gnueabihf": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm-gnueabihf/-/rollup-linux-arm-gnueabihf-4.29.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "optional": true,
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+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm-musleabihf/-/rollup-linux-arm-musleabihf-4.29.1.tgz",
+      "integrity": "sha512-RiWpGgbayf7LUcuSNIbahr0ys2YnEERD4gYdISA06wa0i8RALrnzflh9Wxii7zQJEB2/Eh74dX4y/sHKLWp5uQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@rollup/rollup-linux-arm64-gnu": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm64-gnu/-/rollup-linux-arm64-gnu-4.29.1.tgz",
+      "integrity": "sha512-Z80O+taYxTQITWMjm/YqNoe9d10OX6kDh8X5/rFCMuPqsKsSyDilvfg+vd3iXIqtfmp+cnfL1UrYirkaF8SBZA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@rollup/rollup-linux-arm64-musl": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm64-musl/-/rollup-linux-arm64-musl-4.29.1.tgz",
+      "integrity": "sha512-fOHRtF9gahwJk3QVp01a/GqS4hBEZCV1oKglVVq13kcK3NeVlS4BwIFzOHDbmKzt3i0OuHG4zfRP0YoG5OF/rA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@rollup/rollup-linux-loongarch64-gnu": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-loongarch64-gnu/-/rollup-linux-loongarch64-gnu-4.29.1.tgz",
+      "integrity": "sha512-5a7q3tnlbcg0OodyxcAdrrCxFi0DgXJSoOuidFUzHZ2GixZXQs6Tc3CHmlvqKAmOs5eRde+JJxeIf9DonkmYkw==",
+      "cpu": [
+        "loong64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@rollup/rollup-linux-powerpc64le-gnu": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-powerpc64le-gnu/-/rollup-linux-powerpc64le-gnu-4.29.1.tgz",
+      "integrity": "sha512-9b4Mg5Yfz6mRnlSPIdROcfw1BU22FQxmfjlp/CShWwO3LilKQuMISMTtAu/bxmmrE6A902W2cZJuzx8+gJ8e9w==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@rollup/rollup-linux-riscv64-gnu": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-riscv64-gnu/-/rollup-linux-riscv64-gnu-4.29.1.tgz",
+      "integrity": "sha512-G5pn0NChlbRM8OJWpJFMX4/i8OEU538uiSv0P6roZcbpe/WfhEO+AT8SHVKfp8qhDQzaz7Q+1/ixMy7hBRidnQ==",
+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@rollup/rollup-linux-s390x-gnu": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-s390x-gnu/-/rollup-linux-s390x-gnu-4.29.1.tgz",
+      "integrity": "sha512-WM9lIkNdkhVwiArmLxFXpWndFGuOka4oJOZh8EP3Vb8q5lzdSCBuhjavJsw68Q9AKDGeOOIHYzYm4ZFvmWez5g==",
+      "cpu": [
+        "s390x"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
     "node_modules/@rollup/rollup-linux-x64-gnu": {
       "version": "4.29.1",
       "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-x64-gnu/-/rollup-linux-x64-gnu-4.29.1.tgz",
@@ -325,6 +930,48 @@
         "linux"
       ]
     },
+    "node_modules/@rollup/rollup-win32-arm64-msvc": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-arm64-msvc/-/rollup-win32-arm64-msvc-4.29.1.tgz",
+      "integrity": "sha512-F2OiJ42m77lSkizZQLuC+jiZ2cgueWQL5YC9tjo3AgaEw+KJmVxHGSyQfDUoYR9cci0lAywv2Clmckzulcq6ig==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
+    "node_modules/@rollup/rollup-win32-ia32-msvc": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-ia32-msvc/-/rollup-win32-ia32-msvc-4.29.1.tgz",
+      "integrity": "sha512-rYRe5S0FcjlOBZQHgbTKNrqxCBUmgDJem/VQTCcTnA2KCabYSWQDrytOzX7avb79cAAweNmMUb/Zw18RNd4mng==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
+    "node_modules/@rollup/rollup-win32-x64-msvc": {
+      "version": "4.29.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-msvc/-/rollup-win32-x64-msvc-4.29.1.tgz",
+      "integrity": "sha512-+10CMg9vt1MoHj6x1pxyjPSMjHTIlqs8/tBztXvPAx24SKs9jwVnKqHJumlH/IzhaPUaj3T6T6wfZr8okdXaIg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
     "node_modules/@types/estree": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.6.tgz",
@@ -1091,6 +1738,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/hash-wasm": {
+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/hash-wasm/-/hash-wasm-4.12.0.tgz",
+      "integrity": "sha512-+/2B2rYLb48I/evdOIhP+K/DD2ca2fgBjp6O+GBEnCDk2e4rpeXIK8GvIyRPjTezgmWn9gmKwkQjjx6BtqDHVQ==",
+      "license": "MIT"
+    },
     "node_modules/ignore": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",
diff --git a/app/package.json b/app/package.json
index 2bf463d0e772028881d2e06a64a51251ceaf4005..7ca42815cd6bef58bcdbd0aafca216ae97177dd1 100644
--- a/app/package.json
+++ b/app/package.json
@@ -20,6 +20,7 @@
   },
   "dependencies": {
     "@e/fastboot": "1.1.4",
+    "hash-wasm": "^4.11.0",
     "@yume-chan/adb": "1.1.0",
     "@yume-chan/adb-daemon-webusb": "1.1.0",
     "@yume-chan/adb-credential-web": "1.1.0",
diff --git a/app/src/controller.manager.js b/app/src/controller.manager.js
index 5573a4da7ae7fe377af3b38546e737dfebd5e7c2..bfe32a731f9603d3f4be2d111ef9e11af8ab6ec9 100644
--- a/app/src/controller.manager.js
+++ b/app/src/controller.manager.js
@@ -123,6 +123,9 @@ export class Controller {
             (loaded, total, name) => {
               this.view.onUnzip(name, loaded, total);
             },
+            (loaded, total, name) => {
+              this.view.onVerify(name, loaded, total);
+            },
           );
           this.view.onDownloadingEnd();
           return true;
diff --git a/app/src/controller/device.manager.js b/app/src/controller/device.manager.js
index 981d2c6865dd05dbad8ec5eaf587ea34fade8eae..74aff737139366989a321faacb6fa9f4f8c7ecf9 100644
--- a/app/src/controller/device.manager.js
+++ b/app/src/controller/device.manager.js
@@ -185,13 +185,14 @@ export class DeviceManager {
     }
   }
 
-  async downloadAll(onProgress, onUnzip) {
+  async downloadAll(onProgress, onUnzip, onVerify) {
     try {
       await this.downloader.downloadAndUnzipFolder(
         this.files,
         this.folder,
         onProgress,
         onUnzip,
+        onVerify,
       );
     } catch (e) {
       throw new Error(`downloadAll error ${e.message || e}`);
diff --git a/app/src/controller/downloader.manager.js b/app/src/controller/downloader.manager.js
index 8940e777ba5e8af86c27a8bb7b8f65b30d89717e..4a2937cf281aab51fa2c56d634b09db9ee48af7e 100644
--- a/app/src/controller/downloader.manager.js
+++ b/app/src/controller/downloader.manager.js
@@ -3,6 +3,7 @@ const DB_VERSION = 1;
 
 import ky from "ky";
 import { ZipReader, BlobReader, BlobWriter } from "@zip.js/zip.js";
+import { createSHA256 } from "hash-wasm";
 
 /**
  * Download Manager
@@ -31,6 +32,7 @@ export class Downloader {
     folder,
     onDownloadProgress,
     onUnzipProgress,
+    onVerifyProgress,
   ) {
     let current_file;
     try {
@@ -38,9 +40,43 @@ export class Downloader {
         const file = folder[i];
         current_file = file.path;
         if (filesRequired.includes(file.name) || file.unzip) {
-          const blob = await this.download(file.path, (value, total) => {
-            onDownloadProgress(value, total, file.name);
-          });
+          const MAX_RETRIES = 3;
+          let attempt = 0;
+          let blob;
+          let checksumSuccess = false;
+
+          while (attempt < MAX_RETRIES && !checksumSuccess) {
+            attempt++;
+            try {
+              blob = await this.download(file.path, (value, total) => {
+                onDownloadProgress(value, total, file.name);
+              });
+
+              // Simple zip integrity check: fetch "<path>.sha256sum" and compare.
+              const expected = await this.fetchChecksum(
+                `${file.path}.sha256sum`,
+              );
+              const actual = await this.computeSha256(blob, (loaded, total) => {
+                onVerifyProgress(loaded, total, file.name);
+              });
+              if (expected && actual !== expected) {
+                throw new Error(
+                  `Checksum mismatch for ${file.name}: expected ${expected} got ${actual}`,
+                );
+              }
+              checksumSuccess = true;
+            } catch (err) {
+              console.warn(
+                `Attempt ${attempt}/${MAX_RETRIES} failed for ${file.name}: ${err.message}`,
+              );
+              if (attempt >= MAX_RETRIES) {
+                throw new Error(
+                  `Failed to download and verify ${file.name} after ${MAX_RETRIES} attempts: ${err.message}`,
+                );
+              }
+            }
+          }
+
           if (file.unzip) {
             const zipReader = new ZipReader(new BlobReader(blob));
             const filesEntries = await zipReader.getEntries();
@@ -58,6 +94,13 @@ export class Downloader {
               if (filesRequired.includes(filename)) {
                 await this.setInDBStore(unzippedEntry.blob, filename);
                 this.stored[filename] = true;
+                const fileSHA = await this.computeSha256(
+                  unzippedEntry.blob,
+                  (loaded, total) => {
+                    onVerifyProgress(loaded, total, filename);
+                  },
+                );
+                console.log(`File: ${unzippedEntry.name} SHA256: ${fileSHA}`);
               }
             }
             await zipReader.close();
@@ -103,6 +146,41 @@ export class Downloader {
     return filename;
   }
 
+  async fetchChecksum(url) {
+    const res = await ky.get(url);
+    if (!res.ok) {
+      throw new Error(`Cannot fetch checksum (${res.status})`);
+    }
+    const body = (await res.text()).trim();
+    const match = body.match(/[a-fA-F0-9]{64}/);
+    if (!match) {
+      throw new Error("Invalid checksum content");
+    }
+    return match[0].toLowerCase();
+  }
+
+  /**
+   * Streaming SHA-256 computation for large files.
+   * Processes blob in 16MB chunks to avoid memory limits on low-memory devices.
+   */
+  async computeSha256(blob, onVerifyProgress) {
+    const CHUNK_SIZE = 16 * 1024 * 1024; // 16MB chunks
+    const hasher = await createSHA256();
+    const blobSize = blob.size;
+    hasher.init();
+
+    let offset = 0;
+    while (offset < blobSize) {
+      const chunk = blob.slice(offset, offset + CHUNK_SIZE);
+      const buffer = await chunk.arrayBuffer();
+      hasher.update(new Uint8Array(buffer));
+      onVerifyProgress(offset, blobSize);
+      offset += CHUNK_SIZE;
+    }
+
+    return hasher.digest("hex");
+  }
+
   /**
    * @param name
    * @returns {<blob>}
diff --git a/app/src/viewManager.js b/app/src/viewManager.js
index c0fc89c628c6ec7da57db1581e38d12b5290b377..d122881e6c0b1f41614e44467b731af1ba30d643 100644
--- a/app/src/viewManager.js
+++ b/app/src/viewManager.js
@@ -145,6 +145,21 @@ export default class ViewManager {
     this.WDebug.log(`Downloading ${name}: ${v}/${100}`, `downloading-${name}`);
   }
 
+  onVerify(name, loaded, total) {
+    const v = Math.round((loaded / total) * 100);
+    let $progressBar = document.querySelector(
+      `.active .downloading-progress-bar`,
+    );
+    let $progress = document.querySelector(`.active .downloading-progress`);
+    if ($progressBar) {
+      $progressBar.value = v;
+    }
+    if ($progress) {
+      $progress.innerText = `Verifying ${name}: ${v}/${100}`;
+    }
+    this.WDebug.log(`Verifying ${name}: ${v}/${100}`, `verifying-${name}`);
+  }
+
   onUnzip(name, loaded, total) {
     const v = Math.round((loaded / total) * 100);
     let $progressBar = document.querySelector(