I have searched the forums and tried as many of the suggestions I could find to unbrick my 505, but haven't had any luck yet. I started with the screen hung up on Starting up... Tried soft reset. Tried soft resets often. Tried 10+ resets four or five times, same result.
Tried hard reset - no luck.
Tried to load new firmware. Got the firmware failed to install message.
Plugged unit up to the PC and got Updating Firmware now....
Been like that for 2 days. I'm a little frustrated. Tried PRSCustomizer (which I had been using for years). Tried to flash with an SD card. I tried to scare it with flushing it down the toilet!
Can you see what I have missed? BTW, the battery is fully charged from the original wall wart and a PSP one. (different times, of course)