Quoted from hunter291:

If the 3000 is below 6.35 you can install the 6.35 PRO-B5 temporarily

If the 3000 is below 6.20 you can install the 6.20 PRO-B5 permanently

If the 3000 is below 6.20 (but a new PSP 3000) you can install the 6.20 PRO-B5 temporarily

Click to expand...