Any way to reinstall 3.90M33

[Suzuka09]

is there any way to reinstall 3.90 M33 or better yet, downgrade without a pandoras battery? I've had way too many problems with 3.90 and now Flash0 is appearing as Corrupt on my computer.

[mike_jmg]

Nop
Just pandora

[MicroNut]

is there any way to reinstall 3.90 M33 or better yet, downgrade without a pandoras battery? I've had way too many problems with 3.90 and now Flash0 is appearing as Corrupt on my computer.

Do you know if your PSP mobo is TA-079 or not?
I have been able to verify that this method works for TA-079's
I have not been able to get anyone with a TA-082 to test it.
Your best off getting a Pandora's Battery
You can try this at your own risk:
Soft Down from 3.90M33 to Original 1.5

This has been reported to NOT work on a TA-086
Do not use this if you have a TA-086
So far this has only been tested to work on TA-079's.

[fishyfish777]

I am willing to test your Idea, MicroNut!
(I will PM you ASAP).

I use a TA-082, So I will gladly test it for you.

[MicroNut]

This only works from the XMB on a fully working TA-079 PSP.
It does not work from recovery.
Would be interesting to see if it works on a TA-082
I know that it will brick a TA-086
Only test if you have Pandora and can easily recover using a NAND Dump of your current firmware.