
As the spiritual successor to DevHook, TimeMachine allows PSP users to temporarily revert to a previous firmware by running it from Memory Stick, leaving the on-board firmware files completely untouched.
Still very much a work-in-progress, the initial release of TimeMachine supports the following firmware revisions: 1.50 (PSP-1000 only), 1.50 mixed with 3.40 modules, 3.40 OE (PSP-1000 only), and 3.60 M33 (PSP-2000 only).
A guide for installing TimeMachine can be found in the FAQs and Guides section of our forums.