[Q] From 2.2.1 to 2.1

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hello everyone

i'm not pro in things like this so don't use the hard terms or something. A few days back, i updated my phone to cyanogen 2.2.1. A friend helped me. I want to downgrade now. But, he hasn't made a backup and he hasn't one. So we tried a few options to downgrade, but all of them doesn't work. So my question is: Has someone a backup? We tried already a backup, but the 'data was to large'. So if you upload, please, be sure that it works!!

Thanks in advance

There is no way to put your LG to original state. From now you can only install moddified ROMs, but you cannot put original ROMs ( from LG)

First you need to enter in fastboot mode and make command "fastboot -w"
That will wipe all data that current ROM create. Now when LG is without that data put it in Download mode, and with KDZ updatr update to any fastboot ROM you can find on this or similar page. It should work without any problems.

P.S If you dont wont to setup phone any time you change ROM, make one backup with Clockworkrecovery or vit Amon Ra.
So if you do something bad, you just eneter to recovery mode, and put all data back .

when installed a fastboot rom you could flash an original rom?

pashinator- I read your instruction you give "long time ago": but nothing.
I can always install any room, but only roms with fastboot works.
Any other roms stuck on LG logo.

Originally Posted by pepi74

There is no way to put your LG to original state. From now you can only install moddified ROMs, but you cannot put original ROMs ( from LG)

First you need to enter in fastboot mode and make command "fastboot -w"
That will wipe all data that current ROM create. Now when LG is without that data put it in Download mode, and with KDZ updatr update to any fastboot ROM you can find on this or similar page. It should work without any problems.

P.S If you dont wont to setup phone any time you change ROM, make one backup with Clockworkrecovery or vit Amon Ra.
So if you do something bad, you just eneter to recovery mode, and put all data back .

I dont understand it even more. Could i downgrade to a 2.1 version with all the old function? And what's a modified ROM? And what happens if i follow your commands a what should i do next? Sorry, but like i said: I'm not a pro in things like this.

Yes you can downgrade from 2.2.1 to 2.1

Process have two steps

in first step you enter fastboot and enter command

fastboot -w

now when your data are wiped pull battery , put it back, press down vol + power to enter into download mode, and flash with any fastboot 2.1 rom.

I didn't success to flash original rom, so I assume you will not succeed also
When I flash original rom, LG 540 stuck in first android animation.

But with fastboot roms, LG540 work perfect.

And where did i get a fastboot 2.1ROM?

Originally Posted by jasper580

And where did i get a fastboot 2.1ROM?

since you say this in first post "A few days back, i updated my phone to cyanogen 2.2.1" you already have fastboot rom

Originally Posted by pepi74

since you say this in first post "A few days back, i updated my phone to cyanogen 2.2.1" you already have fastboot rom

But where? The only fastboot ROM i have that i know is the one i have on my phone. And that's 2.2.1
Or am i wrong?
EDIT: or did you mean to update it in fastboot?

And is it possible to use both ROM's the same? So that i can choose which ROM i want to use without up- and downgrade again and again?