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Root how to downgrade 2.3.7 to 2.2

hi guys actually i have updated my lg gt 540 android 2.2 to 2.37 cynogenmode but i faced some problems
i cant select network manually it shows error while searching network
i cant receivwe gprs steeing
i cant see which network 2g or 3 g is using
cant delete all contacts together

Hi guys finally i found a solution for downgrading to original roms ,, i tried in my mobile and i got suceeded , if u wanna downgrade ur lg gt 540 try the follwong proceedure

download this tool first from here
1) First of all, grab the SwiftBootloaderBuilder.zip from http://kulkoff.com/swift/ or from here.


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