PSP Device Hook Sample Launcher v0.41
This surfaced yesterday from BOOSTER; I
finally got around to giving it a test run and it works quite well! For
those wishing to boot 2.50 required UMDs/ISOs on firmware 1.50, your
wish has been granted - Device Hook Sample Launcher v0.41 fully
supports 2.50 emulation, as well as 2.0!
The package includes everything required to get started - including the DevHook firmware (FW) installer and FW files.
Download Device Hook Launcher v0.41
Source: PSP Hacks