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Root Help With Unrooting HTC One M8

Hey everyone, here's the situation that I am in right now:

I rooted my phone and flashed an Insert Coin ROM but wanted to return it back to complete stock form.

I have a HTC One M8 thats currently locked to T-Mobile. The CID is T-MOB010 and the Build Number is 2.22.401.4

There is TWRP installed on this phone, version 2.8.1.0.

The problem that I am having is this: when I boot into TWRP recovery mode, I go to restore and look for the stock ROM, but it does not show up in the menu. I looked in both internal storage and SD Card storage, but it does not show up in either. I also tried moving the files manually through TWRP, but no luck.

I looked through the phones files using the File Manager App and I see the files are there, but once again I cannot see them when I use TWRP recovery mode.

Does anyone know why this is happening?
 
Are you talking about TWRP being unable to see a nandroid backup of the stock ROM (i.e. a backup made using TWRP)? Just want to be clear.

That won't return the phone to completely stock state, because it won't replace TWRP. Unless you have a copy of the stock recovery you can flash then if you want to go completely stock you will need a ROM Upgrade Utility (RUU).
 
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Sorry for the confusion, in order to explain fully I need to show the process I tried using.

I followed the instructions from this site: http://theunlockr.com/2014/06/08/how-to-unroot-the-htc-one-m8-video/

I boot my phone into recovery mode and select the Restore option in TWRP. I try to find the Nandroid backup that I transferred to my phone but it does not show up. I try looking through both the internal storage and SD card but nothing shows up there either.
 
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