No, you must use a Pandora's Battery. Only PSP firmware 3.50 or below can have custom firmware flashed over it without using a Pandora's Battery and Magic Memory Stick. With 3.50 and below you can use a Lumines UMD. With 3.03 and below you can use an unpatched GTA: Liberty City UMD. With 2.81 and below you can use HEN. ---- I wrote a guide here for downgrading without a Pandora Battery:
http://honorshard.com/blog/2009/03/01/downgrade-psp-with-official-firmware-without-a-pandora-battery/ Feel free to check it out and if you like it please share it.
I had OFW 4.05 and successfully downgraded to 4.01 M33-2 without a Pandora Battery!
Yes you change downgrade your psp from 3.90 to 3.71 M33-4 but make sure you download the OFW. Put it in your updates. It has to be version 5.00 OFW. Then you must UPDATE it. Once you done close your psp. Load it back up and download 3.71 M33 from dark alex and just put it in your (game folder). You just got 3.71 M33!!
Dude im sorry i cant answer this howe ver im in the same delima so if you dont mind email me at monsterc13@GMAIL.COM when u get the answer plz gh
Yes. Use Hellcat's Recovery Flasher on a HEN'ed or CFW PSP.
i think it can't be done yet.. maybe in the coming months it would be possible but as of now, it is impossible to downgrade psp slim with OFW 4.21 even with pandora's battery,,,
Unfortunately, no. No firmware version that is over 5.03 can be downgraded without a Pandora battery and a magic memory stick.
You cant. I tryed, you need to have a 2000 to downgrade it.
Simply, you can not.
You can't, even with the battery.
No, you can't. And even with a Pandora Battery, you cannot downgrade the 3000 or the late 2000 model.
definitely no the best u can downgrade without a Pandora battery is 3.03.... what you can do is use the Pandora battery to downgrade and the results will be great I've done it on my psp and when i downgraded my psp i got to download as many games that can fit into my psp(full games of course) so downgrade your psp using a Pandora battery:)
You can't, even with the battery.
Make or buy a pandoras battery
you can't but im trying to see if u can because my psp slim is ver. 3.93 and im trying to downgrade it to a lower version probaly with a Pandora battery but I'll see if its possible to downgrade a slim without a pandoras battery
No. You must restore to Downgrade the Firmware!
You can't. You couldn't even if you did have a Pandora's battery.
You cant yet, We will have to wait for it to come out maybe late this year We shouldn't have upgraded to 5.51
To downgrade Samsung Galaxy S2 without rooting, simply download the appropriate ICS 4.0.3 firmware, preferably from sammobile.com, and flash the gadget using Odin.
Nope, but I would look into getting a Pandora's Battery anyway - it's dang useful, and if you own a bunch of old SNES games, you can play them on the go. As for your original question, however, I'm afraid it's not possible.
you cant, you need 3.03 or below to downgrade without Pandora stuff.
no the PS3 can not go backward to an earlier configuration after an update like you can a pc