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Dropping signal - Rollback firmware without root?

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Thanks Meter 27
Posts: 396
Join Date: Jun 2006
Default Dropping signal - Rollback firmware without root?


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.

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Senior Member
Thanks Meter 123
Posts: 629
Join Date: Feb 2011
Location: Linz
Try to use flashtool. Check this thread:

And then flash another firmware. Download *.ftf files from here:
Nokia Lumia 920
Senior Member
Thanks Meter 87
Posts: 169
Join Date: Dec 2011
Location: Cologne
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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