Currently I have a psp 3000 3G with cfw 5.03 prometheus 3 installed. I was wondering if I should update to a newer cfw and if so which one? I know there is 6.20 TN-E (HEN), 6.20 PRO-B5 and 6.35 PRO-B5. Which is best? Also the only thing I can't seem to do on my 5.03 prometheus 3 is play psp games that require firmware 6.31 and higher. And yes I tried iso tool and it still didn't work.