@zing Hey man,
Just did the offline update and all went good for the Pi4. I still really struggle with PPssPP as when I add games, the Hotkey+Start doesn't work anymore, and there is absolutely no way to either Pause the game or exit the game... I wish there was another emulator for PSP, as I have trouble with it forverer to make things perfect. ( though the performance on the 7.2.1 are super better )
As for the bios, I will let you know.