I recently got a second hand PSP with no battery. It is on firmware 3.11 so I bought Lumines and ran the HEN save game. I then tried to run the 3.11 downgrader but I always get the message that the battery must be at 75% even though I am using a power supply.
Is there any way around this? I know I need to buy a battery but I don't have a credit card to order one ATM. I tried running the 3.80 M33-5 firmware installer but I get an error message saying the game cannot be loaded.