There is a link to the RUU bouncing around. It's AT&T I think. There aren't any network and country specific RUU's around and there probably won't be any either. I have tried it yet but if you do use the RUU from here I think you need to be s-off also. So even when you do restore with the RUU, you might end up with AT&T branding, and your boot loader will show s-off. On top of that by unlocking your boot loader your iemi has been recorded as unlocked now. So it's down to your phone provider and HTC to make the decision to take your phone back. Let's hope they're having a good day and take it back seeing as it's a physical fault and not the software. Just be aware.
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HTC One mini
Magio R3 JB 4.2.2 ROM