[HTC U11  Questions & Answers] PieceKeepr:
I finally got around to updating to the latest OTA and ViperU, but unfortunately the process has resulted in permanent signal loss. I have spent hours trying to get it back and had a very lengthy chat session with HTC support. I tried restoring the modemst2 partition but that didn't work. I tried flashing the firmware separate but that didn't work either. After trying everything HTC could come up with which wasn't much other than clearing the cache partition and running the RUU again through download mode I still have no signal. They will not send me a replacement and said the repair shop is about 4 weeks behind. Apparently the dev team was aware this could happen and is working on a solution but there is no ETA. The suggestion until the update is ready is to try a different carriers sim but I didn't think you could access VZW without a VZW specific sim. Here's the pertinent part of the conversation.

Me:

Carlos, I have ran the RUU twice. Once with the sim card in and once with the sim card out installed the sim card after a reboot and I still have no signal.

Agent:12:35 PM

Sorry for the delay; I appreciate your patience.

Carlos M.:12:38 PM

That sounds awful, Jim. And it would make this even more awful because I was checking with the software support team and they told me they are programming an update to address this situation. However, there is no ETA yet on when is it going to be launched.

Carlos M.:12:39 PM

I apologize profusely for this, and I'm sorry the RUU didn't get your device back online, but this is all the information I have at the moment.

Me:

So what am I supposed to do? I spent $649 for a top tier phone that serves as a paperweight at the moment. I HAVE to have a phone for work!

Me:

Can it not be warranted?

Carlos M.:12:40 PM

I understand you, Jim, but if we send it to be repaired the repair center is having some delays and it's taking up to 4 weeks to process a repair.

Me:

Warranty exchange?

Carlos M.:12:42 PM

The repair center is the one that determines if the device has to be replaced or repaired. There is no exchange option on itself for this device.

Me:

Unbelievable. I've had HTC phones since the ERIS but have never had issues with them until now. I understand it isn't your fault, but this horrible customer service.

Carlos M.:12:44 PM

Believe me, I completely understand how you feel about this. I spoke to the DEV team about it and they said they are working on the update but there is no ETA on the launch date for that update.

Me:

So how am I supposed to know when this update is available?

Carlos M.:12:45 PM

They told me you need to check for updates using the WiFi network and apply the one you'll see when they launch it.

Carlos M.:12:45 PM

You can check in Settings > About > Software update

Me:

So what if that still doesn't fix it? I will not accept paying for this phone and not being able to ever use it again.

Carlos M.:12:47 PM

According to my understanding, this is a specific situation with the Verizon network. They told me that if you use a GSM SIM card like one from the AT&T or T-Mobile network, the device should work normally. If you still see the same No Signal issue with a GSM SIM, we need to send the device to be repaired.

Me:

But their sim cards will not work with VZW correct?

Carlos M.:12:49 PM

Since your phone is unlocked, it can work with those SIMs, but they would be under their own network, not Verizon's

Me:

Well I guess I'm going to try to get a different sim. This sucks.

Carlos M.:12:51 PM

I understand your feelings, and as a customer, I would feel the same way you feel about it.

Carlos M.:12:52 PM

If you use a different SIM (AT&T or T-Mobile) and you still get no signal, please let us know and we can send the device to be repaired.

Me:

Will do.

Me:

I've read some horror stories about the U11 on VZW, it seems that something wasn't tested or built properly.

Carlos M.:12:53 PM

I suppose that is the reason the DEV team is working on an update to address this issue.

Me:

Let's hope.

Carlos M.:12:53 PM

Thank you for your feedback, I will let the DEV team know about this.

Me:

Thanks

Carlos M.:12:53 PM

Is there anything else I can do for you at the moment?

Me:

No