diff --git a/flash_FP3_factory.sh b/flash_FP3_factory.sh
index 09e9eefa92ea0b9403be593620975e62517ac6f6..59669b042fd426efa5e3abf6e1bdac96e6a61663 100755
--- a/flash_FP3_factory.sh
+++ b/flash_FP3_factory.sh
@@ -16,6 +16,8 @@
 set -e
 set -u
 
+CLEAN_FLASH="true" # Control data wipe behavior. Default is "true".
+
 # Target device info
 PRODUCT="Fairphone 3"
 PRODUCT_ID="FP3"
@@ -100,14 +102,20 @@ flash_device() {
   flash_image_ab_or_abort "${sn}" system "${IMAGES_DIR}/system.img"
   flash_image_ab_or_abort "${sn}" vbmeta "${IMAGES_DIR}/vbmeta.img"
   flash_image_ab_or_abort "${sn}" vendor "${IMAGES_DIR}/vendor.img"
-  flash_image_or_abort "${sn}" userdata "${IMAGES_DIR}/userdata.img"
   flash_image_ab_or_abort "${sn}" mdtp "${IMAGES_DIR}/mdtp.img"
   flash_image_ab_or_abort "${sn}" lksecapp "${IMAGES_DIR}/lksecapp.img"
   flash_image_ab_or_abort "${sn}" cmnlib "${IMAGES_DIR}/cmnlib.img"
   flash_image_ab_or_abort "${sn}" cmnlib64 "${IMAGES_DIR}/cmnlib64.img"
   flash_image_ab_or_abort "${sn}" keymaster "${IMAGES_DIR}/keymaster.img"
+
+
+  if [ "${CLEAN_FLASH}" = "true" ]
+  then
+    flash_image_or_abort "${sn}" userdata "${IMAGES_DIR}/userdata.img"
+  fi
+
   $FASTBOOT_BIN -s "${sn}" --set-active=a
-  
+
   echo "INFO: Locking bootloader"
   "${FASTBOOT_BIN}" -s "${sn}" oem lock
   echo
@@ -167,6 +175,30 @@ os_checks() {
   esac
 }
 
+# Warn about data wipe, and ask for confirmation
+data_wipe_check() {
+  if [ "${CLEAN_FLASH}" = "true" ]
+  then
+    echo ""
+    echo "WARNING: Flashing this image wipes all user data and settings on the phone."
+    echo " Are you sure you want to wipe data and continue?"
+    echo ""
+    # Read user's input
+    read -rp " Type \"Yes\" (case sensitive) and press enter to wipe data and continue. Else, just press enter: " a
+    echo ""
+    if [ "_${a:-"No"}" != '_Yes' ]
+      # NOTE: $a is being set by the read command above,
+      #   so the check for a to be set is mostly redundant
+    then
+         echo "WARNING: You DID NOT type \"Yes\", proceeding without data wipe."
+         echo ""
+         CLEAN_FLASH="false"
+    else
+         echo "WARNING: You typed \"Yes\", proceeding with data wipe."
+         CLEAN_FLASH="true"
+    fi
+  fi
+}
 
 echo ""
 echo "*** ${PRODUCT} flashing script ***"
@@ -182,5 +214,8 @@ os_checks
 # If only one device is found $sn will store its serial number
 find_device
 
+# Call function to look for data wipe check
+data_wipe_check
+
 # Flash the device
 flash_device