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Dropping signal - Rollback firmware without root?

30th December 2011, 09:32 PM |#1  
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I have an Arc here suffering with dropping signal issues (FW 42, baseband -56).

What's the best way to downgrade (or upgrade for that matter) the software, without the need for root. It's not my phone so I don't really want to root it etc.

30th December 2011, 09:45 PM |#2  
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Try to use flashtool. Check this thread:

And then flash another firmware. Download *.ftf files from here:
2nd January 2012, 10:44 AM |#3  
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Or use Wotan. They provide a nice software free of charge which does the job for you here (ARC S) or here (ARC).
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