I just wanted to say a big THANK YOU! I've been trying to get USB Loader GX to work on my Wii U for the past week since I bought it - your guide is the only one that worked.
Not sure about other models of Pi4 but the Pi 4 B with 8GBs OCed to 2Ghz handles PSP really great except like 1 game I found and it is playable it just looks bad lol Motor Storm Arctic something or other.
@Psionic Roshambo:
Not sure about other models of Pi4 but the Pi 4 B with 8GBs OCed to 2Ghz handles PSP really...