Hi, I'm quite the noob with this. After customizing the firmware on my Phat PSP to v3.80 M33-5, my PSP doesn't start up properly if a UMD in the slot. Nor does it even show me the UMD icon if i remove it, let the PSP start properly and re-insert it.
I installed a homebrew version if QMixer that plays without a hitch, so I'm quite confused.
Any ideas will be greatly appreciated guys.