Updating m33 firmware
How to update the PSP custom firmware: Since the 3.90 M33 version, it is possible to update the custom firmware directly from the "network update" menu.
The co-worker i got it from states it hasn’t been turned on in like 6-7 years.
Due to this (and probably some other reasons as well), Sony has been trying to repress homebrew as much as possible.
Watch this video to learn how to update your Sony PSP to firmware 3.71 m33-4.