[One (M7) Q&A, Help & Troubleshooting] mirkuma:
First, sorry for this tread. I started to read across HTC ONE related treads, but then I give up on the end... just to many informations...

If i had time I'm sure that many if not all this questions are answered somewhere in HTC ONE forum.

I have only one day do decide if I'm going to buy HTC ONE, due to end of special promotion sale (with 24 months binding to my network provider), so I will really appreciate XDA and HTC community help, as I can't go trough all those 100+ treads in one day.

So here are my infos & questions:

I'm only interesting in HTC ONE for the reason that could be converted to Google Edition phone and that it's build quality and design is much better than Nexus 4. I own SE Xperia Ray and Nexus 7 both rooted and slightly modified, but mainly stock, and I love vanilla look and regular updates of Nexus from Gogole. I intend to run HTC ONE few weeks with STOCK and then go for GE.

I live in Slovenia/Europe, so HTC ONE will be bought here. It is SIM unlocked, not operator dependant, but may have some network operator/provider specific programs installed.

So I assume that this is International version of the phone (it's stated, that LTE is supported) and it comes with Android 4.1.2 version presumably not updated.

1.) If it is still on 4.1 Android will I be able to convert it to GE? What if is on 4.2.2 or 4.3? Is there already a correct stock GE rom for EUR version?

2.) Is S-OFF possible and needed also for EU version of ONE? (if yes, this is a must for changing CID, which is needed for a proper GE ROM installation? is my understanding correct?) On HTC site, One can be rooted officially, I assume this is also valid for EUR version. Even rooted phone needs S-OFF? meaning GE ROM cant be flashed? Sorry, S-OFF is something completely new for me (non-existing at Sony or Nexus 7)

3.) Will LTE work properly with GE (GE is for american phones this will be European/International) Are there any other restrictions, that I need to be aware if going for GE (radio versions...)?

4.) How is going back to stock HTC rom (in case of warranty claims)? Is it country specific and can be automatically done with HTC software (like Xperia and Sony PC Companion - Repair phone function) or is there generic ROM (like Google provides for Nexus 7, that can be flashed back. In this case should rom be country specific? Any simple way to dump and backup original stock rom that phone comes with?).

5.) OTA updates from Google. Some threads debating about working OTA, others have remarks that OTA won't work. So is it possible to convert to latest 4.3 GE with working OTA? (I love this feature on Nexus 7, but can be easily broken if some changes are done in root/system)

6.) ONE has 3 physical buttons (capacitive) below screen (not on screen like Nexus phones/tablets). Is GE version adapting those 3 buttons, or there are double buttons (on screen also visible). Is there a fix for that? I'm asking this as I have fully adopted to on "screen buttons" with Nexus 7

7.) Is it safe to assume that there will be also 4.4 KiteKat GE OTA/ROM for HTC ONE?

8.) Any other important stuff that i I'm not aware of it (some programs not working, DRM protection issues for some stock programs, etc)? So is GE convert a full convert or just partial and is better in this case to stick with Nexus phones?

Thank you all for answers in advance!