ok so i figured out that you have to apply the patch before you install the 1.50 update. i tried this too many times on both 3.80 and 3.90. if you apply the 1.50 update before it wont allow you to patch the files for some reason. then you have to re-flash your psp. if someone could explain why this happens for me that would be awesome. so remember " use the mac spoofer app to patch the files first. then apply the 1.50 update. good luck and have fun.
*UPDATE* well i tried it with 3.02OE and it wouldn't flash, i figured it had to do with the 1.50 subset in the OE firmware.