Signed LCFW (Light/temporary Custom FirmWare) for PSP models running the official 6.20 CFW. This version also has an option to do a full install, and works on any PSP that can run the 6.20 OFW.
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi