DevHook 2.71/2.80 Hybrid for 1.5 & 2.71 SE-B
Have you read about the DevHook Hybrid mod? I’m not sure who discovered this but essentially it corrects compatibility with many 2.80 required titles under DevHook. And when the same method is used (flashed) with 2.71 SE-B'’ you can directly load 2.80 ISOs from the PSP XMB. You can read more about this mod
here, and
here.
The safest method is with DevHook — all on the memory stick and nothing is written to flash; however, if you wish to go the FW flashing route, be careful. USE AT YOUR OWN RISK!
Download DevHook 2.71/2.8 Hybrid Installer
Source:
PSP-Hacks