"Before anything else, we have to put up a disclaimer. When you mess with your firmware, you stand the chance of bricking your system.Let us repeat that once more:
tinkering with firmware versions can render your PSP deader than roadkill. So. 0okm just released a downgrader from 2.50 to 1.50.
Yes indeed: 0okm claims to have come up with a 2.50 TA-082 SoftDown downgrader to 1.50. All you 2.60/2.71 users, however, still have to wait. It's time to tread lightly, folks, because 0okm requires people to email their own ISP email, PSP serial number, and FW dump Data. Here's 0okm's statement:
if your PSP is FW2.50 TA-082 and you Trust me & support me
Agree NOT share my program & softdowned FW dump data to anyone
you know "Flash write" program may brick the PSP and Use it at your own Risk
you have a "ISP email Acc"Q: Why need Trust me ?
A: because you need to give me your "ISP email", "PSP Serial Number" and "FW dump DATA".
Q: Why can't shared my program to other
A: because each program just for one PSP, other PSP use it will brick !!
Q: What happen if you shared my program & softdowned FW dump data to anyone ?
A: i will RELEASE ALL your personal information and STOP help people SoftDown !!!
Ok, so now that you know 0okm's terms, it's going to be up to you to decide. As we said, we have to tread lightly on this. It's pretty sensitive information you're giving out, so it's your call if you want to take up 0okm's offer. If you do agree with the terms, you'd have to email them in so you can find out what to do next. There's more info behind the Read link, so for those who want to pursue this, click below."
En gros il a reussi a faire un downgrader pour TA-082 ,il faut lui fournir par contre plusieur information consernant votre psp comme "ISP email", "Numero de serie de votre PSP" et "FW dump DATA" et il vous fera un downgrader sur mesure fonctionnant que sur votre psp.
Source: http://pspupdates.qj.net/FW2-50-TA-082-SoftDown-to-1-50/pg/49/aid/68087
Site Officiel:http://0okm.blogspot.com/2006/10/psp-fw250-ta-082-softdown-now-start.html