I currently running 6.20 PRO-B8 on my PSP 3001 model 3g. I saw in this thread that I can get 6.20TN-B and then downgrade to 5.03. Which is the best 5.03 HEN, 5.03 GEN, or 5.03 MHU? Will these work on my psp? And should I get TN-B and downgrade (will it be better)?