Thank You for contacting HTC.
We are very sorry that You have issues with Your phone. Sadly, we do not have the ability to give original RUU. We are very sorry for the inconvenience. The only solution we can think of is to go to official HTC repair center. There, they can only install it for You. Sadly, since You have unlocked bootloader it won't be covered in warranty, so You would have to pay for it.
I will send all the information of our official repair center:
Begram servis
Beograd
Bulevar Mihajla Pupina 117
11070 Novi Beograd
Telefon: 011 785 3888
Radno vreme:
Pon- Pet: 08:00- 20:00
Sub- 09:00- 15:00
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Sincerely,
Ivan
HTC