The point is you don't need a Pandora battery. TA-85v2 and up can't create one. There are also a lot of battery packs that can't be converted.
Is there really no way to downgrade 6.35 to 6.20 on the newer models ? Maybe using an older version.txt ? I'm interested in buying the PSP 3000 Gran Turismo bundle (04g modules) from a friend but the dipshіt upgraded the firmware...