I have done it but cannot see anything is deleted. I still have "backupmenu" but with no capitals.

Installed the last one 0.54-1 and booted with keyboard open boot menu show 2 item "Flash" and "power off when charger is not connected" and then screen go blank what ever I choose. UP and down work but excuse me which button is CENTER ?

As a newbie I think I wait until moore info is available.