There are multiple options to uninstall Klipper Mod from an AD5M (Pro) printer.
Warning
During uninstall, all you local changes to the mod are removed from the printer. That includes all your custom files such as the G-Code files or custom Klipper configuration. Make sure to create a back-up if you want to re-install at a later point.
If you just want to go back to go back to the stock software occasionally, consider to use on of the Dual Boot options described in the Install documentation.
Download the Adventurer5M-KlipperMod-uninstall.tgz file from the Release page onto a USB flash drive, similar to the Install procedure.
Alternatively a marker file klipper_mod_remove will also trigger automatic uninstall during printer start-up.
Log in via SSH run the command remove-klipper-mod. Confirm removal. The printer will reboot and automatically uninstall the mod during start-up.
Run the macro REMOVE_KLIPPER_MOD and confirm the removal. The printer will reboot and automatically uninstall the mod during start-up.