[One (M8) Q&A, Help & Troubleshooting] Nd2learn:
Ok, so I did a little digging around, and it seems like I should be able to handle this. But I would really like some guidance from some experienced developers. I recently bought a certified refurbished factory unlocked m8 from Amazon, and it is branded T-Mobile. I I am a cricket user so I run on the att towers , not that that really matters. I just want to get this thing unbranded , and loaded with the HTC sense and or android software without having any of the T-Mobile screens or apps or any of that. Like it came straight from HTC with no carrier stuff on it. I understand I'll have to root, S off ( whatever that means) and a bunch of other things. I've played with it a little bit, getting into fast boot and recovery mode on the phone itself while not connected to the computer. I have no software that I need for this task, nor any of the roms yet or anything else. I am hoping this community of developers can help me with suggestions for the easiest and quickest way to do this, and then I think I want to relock it, not to a carrier but so that everything stays set until and if I decide I want to do any more with the m8. I want the m8 just stock HTC like fresh off the line, not really sure I need developer mode unlocked on it as far as the rom or what have you. But,I'm not sure, that's why I'm here hoping you guys can help me. And I was looking through the posts about doing this to m8'S so please don't just point me to those, I need some more clarification and basically just a step by step on how to get this done , and then I'll probably be asking for tips on what I can do with the desire 520 , if all goes well with the m8 and it replaces my 520 then I would like to use my 520 to practice and see what all I can do with rooting and modifying everything . Anyways. To recap Please help me get the m8 like I just bought it from HTC with no carrier so only stock HTC software, and I don't know if it still gets updated or not but the ability for ota updates just in case. And locked back up so I can't somehow accidently screw it up. And thanks in advance for all your help and advice everyone

UPDATE

Here is what I see on the screen when I do the volume down and power button when powering on the phone

***software status: official***

***LOCKED***

M8_UL PVT SHIP S-OFF

CID-T-MOB010

HBOOT-3.19.0.0000

RADIO-1.29.213311491.05G

OpenDSP-v51.2.2-00593-M8974_FO.1015

OS-6.20.531.5

eMMC-boot 2048MB

Mar 1 2016,00:59:13.3

Ok guessing I'm in S off mode already based on that and figured that this information would help you guys better inform me of what steps I will need to take .

Does anyone know if loading the newest rom from HTC for unlocked phones will get change the cid and remove the T-Mobile apps or will I need to manually change the cid to something somehow and then load the HTC rom. Please any advice would be very helpful, there is so much content on this site to sift through and I work twelve hour shifts 6 days a week and have a two year old, I am having a tough time finding the time to go through all these posts so any advice on this or please link me to a post that would solve this would be immensely helpful and very appreciated