I was messing around with the WAB Version Changer (2.0 & 2.5) last night while trying to get some ISO's to boot on my V1.5 PSP. Nothing worked so I put it down for the night and was playing around with it again for a bit this afternoon. I saw that the firmware was listed as V2.0 in the system settings menu. No biggie since I can easily change it back to V1.5 using the WAB changer, right? Wrong. I've tried everything and it's still stuck at 2.0. Every time I try to use the WAB changer to get my PSP back to V1.5, it says "Plug your AC Adapter and press Triangle". My AC adapter is plugged in though and the battery is at full power.
My PSP can still load ISO's and run homebrew, but the system profile still says it's running on V2.0 firmware. Is there any way to get it back to say V1.5? I've tried everything and couldn't figure it out.