questions on 3.50 downgrader

[pussy]

last month i upgraded my psp with a sony 3.40 firmware...cn i use the 3.50 downgrader to downgrade my psp?
 

[wakaru]

Of course you can.
But you MUST be running the 3.50 Firmware, so update your PSP to 3.50 first, and then you can downgrade.
Remember to upgrade to 3.50 manually, cause if you use the network automatic updater from PSP you will get 3.51 instead and you will be screwed.
Follow instructions from the Readme.txt file of the downgrader, which are clear and simple.... Besides, there is a reason why they are clled README.TXT.