In many Android versions, the system includes a safeguard script located at /system/etc/install-recovery.sh or /system/bin/install-recovery.sh . Its primary job is to check the integrity of the recovery partition; if it detects a custom recovery, it automatically reflashes the original factory recovery.
Below is a draft post you can use to explain its purpose and how to manage it, especially for users trying to "stick" a custom recovery. skachat fail install recovery sh
Modern rooting tools like SuperSU or Magisk typically patch or disable this script automatically during the installation process. In many Android versions, the system includes a