downgrading my ics help needed

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hey guys i need some advice about downgrading my arc s to gingerbread stock.... i am running ics stock build number 4.1.b.0.587 .... my phone is unrooted bt bootloader is unlocked.... i read different downgrading guides which said download .ftf file and using flashtool flash it.... i tried many of them but while flashing i got error around 80% of flashing saying some file missing flashing aborted.... i tried three different firmwares bt got problems.... can any one help me with that that i need to root my phone or can just roll back to gb without rooting.... it would be greatly appreciated if someone posts a tested mirror for gb ...
thanks in advance.

Re: downgrading my ics help needed

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Try to get an older version of flashtool v6.8 or something, Newer versions have some issues with flashing GB ftf

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