[AT&T HTC One (M7)] donaldvle:
***SOLVED***

I did attempt two. I was unable to sideload using TWRP because it was unable to mount. I decided to format data again. Then I put my flashdrive into the OTG cable and plugged it into the phone. I flashed CM 10.2 Stable and BOOM it worked. Moral is that if you cant mount, reformat it and try using an OTG cable if you cant sideload. Three days paid off. My phone works again! :)

-Donald

***SOLVED***

(Below is original question)

First of all, hello everyone. I just made an account and am glad I've done so. Seems like a website that's friendly to a mildly knowledgeable android user (well, im a bit of a noob).

Phone:

HTC ONE m7att, twrp recovery, unlocked bootloader (dont know what version, but latest im assuming b/c i got it off warrantee December) I think it isnt rooted anymore because when i reboot from TWRP, it asks me if I want to install SuperSU.

Description:

I was trying out CWM (latest one) to flash CM 11, and it worked, but I didn't like the look. So I flashed TWRP (latest one) to restore my TWRP CM 10.2 backup. I wanted to wipe 'dalvik cache' 'cache' 'data' and 'system' (advance wipe), but i ended up also wiping internal memory. Oops.

Attempts:

1.) I decided to try this http://xdaforums.com/showthread.php?t=2251800

I ended up stuck where I am suppose to flash the ROM zip. My guess is that I have been flashing the wrong ROM files (I tried flashing a few after failed attempts) I guess the solution to this would be to find the right file, but I cant seem to find it after hours of searching, amongst other methods to add an OS. (Oh and I should note, my bootloader was LOCKED before I tried the RUU) Speaking of which...

2.) I decided to sideload a custom ROM. Ive never done this (First time rooting was late September 2013 with d2att Galaxy s3, which is MUCH easier to work with). I tried mounting it with data and later USB-OTG with little success. When I try to ADB Sideload, it is unable to mount. (Bootloader is UNLOCKED)

Questions:

If i was to do attempt 1, can someone please provide me with the correct link to the correct ROM.zip? Ive tried several download threads for the AT&T HTC One with no success.

If I was to do attempt 2, (which i prefer because I want to run CM 10.2) How do I fix the "unable to mount"? Ive tried reflashing the TWRP recovery through fastboot. And also, bonus points for showing me how to transfer zip with sideloading (bonus because I have found a few videos and threads, but they were not clear)

I have done about 4 to 5 hours of research with no luck. Please dont ridicule me for "not searching the threads," because I am frustrated after doing just that with little luck. I know this should be an easy fix, which adds to the frustration. Please help!! Thanks for reading.

I just looked this over, and my ignorance clearly shows, so please be respectful about that. Guidance is helpful, judgement is not, so dont post what I already know about my semi-lack of knowledge with using Android. Thanks.

UPDATE (Still need help):

Another problem I ran into was that the /sdcard would not mount for any recovery. Im guessing the /sdcard is corrupted. Any help with that would be appreciated. Also, I was able to sideload CM10.2 zip file with CWM on another computer, but when I reboot it, it got stuck in a boot loop.

Its been a whole days worth of trouble. First World Problems huh? Please help ASAP! Thanks again.