Psp Slim PSP-2000 bought from japan downgrade

[yanghua]

Hi,
i tried to install DC v8 on the stick and used the pandora battery to downgrade or upgrade my fat PSP to 5.0 firmware.
When I try to use the same battery on this new slim PSP the psp turns on  but nothing happens, usually with the key I am holding (up key) the memory stick will start to access quickly and showing me the msg ask me if I want to install the firmware. But in this case it did not happen.
I switch back to the fat PSP and run the same process and it worked. Then I went back to the PSP slim its the same result.

Any idea what I did wrong or I need to make a special battery just for the PSP Slim?
Or the memory stick I made don't work with the slim?

Thanks

[Loonix]

Quite probably you have a Slim PSP with a TA-88v3 Mainboard
Have a look at the TA-88v3 identifyer tutorial at the exophase Forum

If your Slim reads music, pictures and loads ans saves gamesaves that is most probably what is wrong.

[yanghua]

If your Slim reads music, pictures and loads ans saves gamesaves that is most probably what is wrong.

I don't understand this part?
Aren't all PSP reads music/picture and loads saved games?

Thanks

[Loonix]

If your PSP does not do that it most probably has a defective Card reader or dirt in the slot

[yanghua]

It does read everything.