PSP 2001 won't play any PS1 classic games from the PSN store with the CFW 6.61 LME-2.3. Changed the ISO to M33 to no avail. Am I missing something here? : r/PSP
Wszystko o PSP E-1004 / All about PSP Street.: Installing custom firmware on your PSP E-1004 and other PSP's for dummies.
PSP: Revision 2.3/10.3 of the ME & LME CFW is now available - Adds Pro Online support, DAX-format and more! - Wololo.net
PSP Custom Firmware Guide For All Models 2021 - pspunk
PSP Custom Firmware 6.20 LME-1.9 can now be permanently installed! - Wololo.net