[Q] RUU Failed - AT&T HTC One (M7)

I'm trying to return my HTC One back to being unrooted because I wanna update it and almost everywhere I read, you need to unroot to get over the air updates. So I got S-Off and I relocked my bootloader, but whenever I try running the RUU, it always fails. I tried flashing it and I tried running the exe file. Why does it keep failing? Also, is it true you can't get OTA updates while being rooted? The RUU I use is for Cingular (which from my understanding is the one AT&T uses) and I have Super CID. Lastly, if anyone knows an easier way to return my phone to being completely stock and unrooted that would be great. Thanks in advance!

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Which RUU did you use? Apparently the last official one was JB 4.3 w/ Sense 5.0, ver. 3.17.502.3. The one for KK4.4.2 w/ Sense 5.0, ver. 4.18.502.7 was apparently not actually released by ATT and many people were having problems with it.
clsA said:
Well near as I can tell the RUU did not originate from HTC, someone was able to create it and sign it same as HTC would. But the files behave differently than the "Real" HTC RUU. The only solution I found was to use the True HTC RUU from 3.xx.502.x and OTA to 4.xx.502.x to 5.xx.502.x. It requires s-off to flash the OTA's so it's not the perfect solution for everyone.
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So if you tried with the KK4.4.2 RUU, download the JB4.3 RUU from http://www.htc1guru.com/. Since you're S-OFF, you can use either the .exe or the decrypted .zip. I used the decrypted .zip before and it worked fine. Once you get that flashed you can then take the OTAs to update to KK4.4.2 w/ Sense 6. You'll need to be on the AT&T network to get those OTA. Otherwise you'll need to manually flash the updates, as clsA states in his post that I quoted above.
As for not getting OTAs while being rooted....
It's not so much that being rooted prevents getting OTAs. It's the process of getting to root that modifies or deletes system files that need to be intact for the OTA to work. OTA need to be installed through stock recovery. If you're rooted, it's most likely that you have a custom recovery. Also, unlocking the bootloader deletes some files the OTA checks for. If those files not there, the OTA will not install.
Flashing an RUU is the easiest way to get completely stock. It resets the phone to an out-of-the-box state. Whereas a factory reset done from bootloader or recovery basically just wipes the data partition, which will remove any apps you installed and user data. But any modifications to the system partition that are done remain. You don't get back the files that are deleted when you unlocked the bootloader.
Also, since you are S-OFF, there's no need to relock your bootloader to run an RUU. That's only required if you're S-ON. And once you get S-OFF, there is no reason to go back to S-ON.

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Since I just want to get the new OTA update, do you recommend I just flash the update as opposed to going back to stock recovery because I don't mind having a rooted phone? Also, my phones camera suddenly became blurry, is it possible that the rooting had something to do with it? If it did, would flashing the OTA update fix it or would I need to go back to stock recovery or would neither fix it? Sorry for so many questions.

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First off, what version is currently on your phone? Depending on where you're currently at you may need to flash more than one update in order to get it to the latest version. And no matter what, you'll need to flash stock recovery in order for the updates to flash. OTA updates, whether taken OTA or flashed manually, require stock recovery, as I mentioned before. Also, again as I mentioned before, the process of rooting your phone (more specifically, the process of unlocking your bootloader) most likely deleted files from your system partition that need to be in place in order for the OTA updates to install. If they are not there, the update will fail. So to answer your question...No, I don't recommend "just flash the update as opposed to going back to stock recovery". It won't work.
Since you didn't answer my question and state which RUU you tried, I don't know if you tried a bad 4.4.2 RUU or if there are other issues with your device and/or computer that's preventing any RUU from installing. If you just don't want to flash the RUU, then you can try flashing the update in the phone's current state and when it fails, you can analyze the error report, try to track down stock versions of the files you're missing and restore them if you find them, then try the update again, hoping you found everything. That's a lot more of a hassle than just flashing the RUU, flashing the updates, rooting, and setting up your phone.
Another option is to just flash a custom ROM. Most of them will bring the phone up to the latest version. Some will even take it higher than what is officially available from AT&T.
As for your camera problem, can't see how just rooting would cause that, but maybe it did. Without knowing the cause of the issue, I can't say if just flashing the OTA would fix it. If it's a software issue, then possibly it would. If it's a hardware issue, then probably not. Focus on updating the phone and worry about the camera issue if it still persists once updated.

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Sorry, I forgot about your question. First of all, I got it working using RUU Zip M7 UL JB43 SENSE50 MR Cingular US 3.17.502.3-decrypted. The one that didn't work for me is RUU Zip M7 UL JB 50 Cingular - 1.26.502.12. Second, I am running 4.4.2. Thats for anyone who comes across this and was wondering. Thanks for your help sharksfan7. Also, in case you were wondering, my camera is still blurry, but I'll start a different thread for that.