If there is no uboot, or a bad uboot, the pbp will appear dead
If there is a bad uboot, it may 'remember' and also not be bootable (later)
For example, put a a64 sd card in, you will think you have bricked it
It will appear dead, recover by a reset, long presses or remove back (and press reset)
So try another image or redo burn or another card
If there is a bad uboot, it may 'remember' and also not be bootable (later)
For example, put a a64 sd card in, you will think you have bricked it
It will appear dead, recover by a reset, long presses or remove back (and press reset)
So try another image or redo burn or another card