Samsung devices come with a unique boot mode called “Download mode”, which is very similar to “Fastboot mode” on some devices with unlocked bootloaders. Heimdall is a cross-platform, open-source tool for interfacing with Download mode on Samsung devices. The preferred method of installing a custom recovery is through this boot mode – rooting the stock firmware is neither necessary nor required.
Please note: On windows PC's to run the installation using ODIN check this [HOWTO](https://community.e.foundation/t/howto-install-e-on-a-samsung-smartphone-with-windows-easily/3186). The steps given below explain how to install Heimdall and flash /e/OS
1. Enable OEM unlock in the Developer options under device Settings.
> It appears sometime that the OEM unlock option is missing from Development options, especially on new devices. Please connect your device to the wifi and check of system updates. After a reboot, the option should appear.
@@ -17,6 +19,7 @@ Samsung devices come with a unique boot mode called “Download mode”, which i
1. Select Samsung USB Composite Device or MSM8x60 or Gadget Serial or Device Name from the drop down menu. (If nothing relevant appears, try uninstalling any Samsung related Windows software, like Samsung Windows drivers and/or Kies).
1. Click Replace Driver (having to select Install Driver from the drop down list built into the
1. If you are prompted with a warning that the installer is unable to verify the publisher of the driver, select Install this driver anyway. You may receive two more prompts about security. Select the options that allow you to carry on.
1. On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window, and type:
```shell
@@ -24,6 +27,8 @@ Samsung devices come with a unique boot mode called “Download mode”, which i
```
1. If the device reboots, Heimdall is installed and working properly.
{% if device.recovery_install_need_patch %}
## Patch de device
@@ -33,6 +38,7 @@ Samsung devices come with a unique boot mode called “Download mode”, which i
1. From the computer, please run `adb sideload <patch file>`
{% endif %}
## Installing a custom recovery
1. Download a custom recovery - you can download [TWRP](https://dl.twrp.me/{{ device.codename }}).
