
Hehe, you guys waited for a long time and now here's the solution:
Dark_Alex Mathieulh and Yoshihiro found a way to upgrade your beloved 2.5 /2.6 Firmware PSP.
BUT: USE IT AT YOUR OWN RISK!!!Instructions for the 2.50/2.60 user1) Copy the folder the DOWNGRADER/2.50/DOWNDATERTEST if you have 2.50
or DOWNGRADER/2.60/DOWNDATERTEST if you have 2.60 to /PSP/GAME/ in your memstick
2) Wait someone with 1.50 to pass you a folder called DOWNDATER and copy it to the root of your memstick.
3) Init gta and the eLoader
4) In the eLoader menu, choose the downdater test. WARNING: the program won't output any display
and any warnings, it will init the downgrader process inmediatelly.
5) You'll see the your memstick flashing. That means that your psp is being flashed from the memstick.
You won't see any type of output in the screen (this is for safety). When the memstick finishes of
flashing, WAIT at least a minute, and then reinit your psp by holding the power button.
6) That's all. If all went right, you'll have 1.50. If it went less good, you'll still have
2.50/2.60. If all went wrong, you'll have a bricked psp(except in the case you have
the modchip) Remember that you have accepted that risk.
Users with TA-082 psp's shouldn try this. Also, it may be better that at the beginning, only users
with a 2.50/2.60 NOT from factory (they updated from a below firmware) try this.
HERE you can download the
Downdater.
All needed files are included :-)