I've researched for hours on the internet and tried almost every suggested solution, but nothing seems to help. It's a well researched problem.
I have a PSP 1000, using 5.50 Prometheus 4 and Popsloader containing pops from 3.00-3.003, 3.10, 3.11, 3.30, 3.40, 3.51, 3.52, 3.71, 3.72, 3.80, 3.90...