PSP-Hacks.com

Description:
The Noobz / Dark_AleX's homebrew enabler (HEN) and downgrader for people stuck on firmware 3.11.

As you may know, if you have a TA-082/TA-086 motherboard , then if you downgraded your PSP to v1.50, its idstorage keys will have been patched during downgrading to avoid bricking. The latest official Sony firmwares (3.30 onwards) detect this patch, and refuse to allow you to upgrade. Without a hardware solution, this can leave you trapped on v3.11 firmware, with no way to upgrade, and no way to downgrade.

See README.TXT