Just get the devhook that emulates 3.11 that would be better than the old 2.71. then just press home and change the speed to 333mhz
EDIT: just found this if you really wanna stay with 2.71 devhook and have it running at 333mhz
1. Run iR Shell.
2. Press R+Start repeatedly until the PSP is clocked up to 333mhz (Check the green numbers at the top of the screen).
3. Run Devhook 0.46 through iR Shell.
4. Choose "CPU Speed".
5. Choose 333/166.
6. Choose "Start".
7. The PSP will successfully boot 2.71 firmware clocked at 333mhz.
This workaround is quickest for iR Shell regulars who put their PSP on sleep in iR Shell in order to bypass the PSPs XMB when turning it on, but there is also another workaround. You can just start devhook then hold home and hit select until you get to 333mhz, which also doesn't crash the PSP.
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