I wasn't aware that I should have upgraded the firmware with the custom .pbp file attached to be able to play iso's/ homebrew. So now I'm stuck with the latest firmware with no ability to updated to the custom firmware. I've read that for this to work, I need to first downgrade to a much lower version of the firmware and then upgrade again, but that seems somehow riskt for me, and I'm not even sure if it's the solution. So can any kind souls around here help me? Thanks in advance.