After some experiments, I found, that, Pandora after startup "downgrade using 1.50 eboot.pbp", IF there are TA82+ PSP and 5th key is ORIGINAL (not patched), Pandora says:
You have a TA082+ PSP, which needs to be patched
before it can be downgraded.
Pres X to start the patch. By doing it, you accept the
risk and ALL the responsibility of what happens.
If you don't agree press R-trigger button.
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(but if your key is already different, than "original" - you don't got this message)
(my psp with "unrecognized key state" of 5th key, that I damaged by wrote into it a random-text - is successuly booted CFW)
If you cancel ID Storage 5th key patch, you return to main menu of pandora recovery.