No network and "com.htc.htcdialer is not responding."
I had purple tint on my old HTC One, so I sent it for repairs under warranty and I got a completely new unit. It was working for a day, but today it couldn't connect to the network. At first I thought it was a HW issue, but I realized that Dialer was crashing with a message: "com.htc.htcdialer is not responding.". That made me think it was a software problem, so I tried doing a factory reset in HBOOT, but now htcdialer is still crashing, and I can't even go through initial setup, it just keeps rebooting when I try to unlock it for the first time. Is there any other way to flash a ROM, without being able to boot the phone?
Everything is completely stock, bootloader is locked and phone is not rooted. I updated it to the latest available version, 4.4.2 with Sense 5.5, I'm unsure what version it exactly is. I would like to keep it stock for at least a couple of days in case there is a hardware failure and I have to send it back to service, but I can do anything if it's necessary.
Thank you very much.
HBOOT image, if it is of any help: http://i.imgur.com/3XKC6Br.jpg?1