Can't switch back to 3G or LTE. Left with only 2G connection.

Facts:
- OnePlus 2 (European Edition, Germany)
- CM13 (13.0-20160721-NIGHTLY-oneplus2)
- Provider: Telekom (Congstar)

My OPT refused to switch to anything more then EDGE (2G) a few days ago. First I though the network was down but after a few days I checked with other phones and only mine wont switch to 3G or LTE.

When I tried to cheange the "prefered network" toggle, I switched it to 2G and now I can't switch it back to 3G or LTE. The options are still there but when I select them they instantly switch back to 2G. Even in the Advanced menu that you can enter by dialing *#*#4636#*#* I can't the setting is fixed to "GSM only" and I can't change it.

When I search for network I can only find 2G networks. In the Results are only Vodafone 2G and Congstar 2G which is my provider.

I would love to get this fixed without completely reflashing my device. Does any one else have a similar problem and maybe a solution?

Recommendation for a device that can lock on LTE.

Greetings
I have a need- locking device on LTE only.
The need is for testing in my workplace.
I would like to buy a device that I set it to this option easily, without installing ROM, etc.

can you give me a recommendation for a specific device, Specific Model and a Specific Android version?

I came across a number of online forums and posts-
were not conclusive regarding the specific device/ Model/ Android version:
http://repo.xposed.info/module/com.s...s5.lteonlymode
https://almost-a-technocrat.blogspot...e-network.html

Many thanks in advance
Shai

Trouble with unlocking and/or rooting htc incredible 4g lte.

I have been trying to unlock/root my verizon inc 4g lte for almost a week now, and I am having no luck. When i put the token in the htc dev sight i get:

Error Code: 172.
Error Reason: CID Not Allowed (MID not exist in Model Rule).

is there a way around this??

I read about Hasoon's all in one toolkit, and i tried version 1. no luck. I found that there is a v.2, but i could not find a link to it anywhere. I feel like if i could just find the v.2 i could give it a try, but i am concerned that i will never get past the htc dev sight as long as i keep getting the error.

does this mean that rooting/unlocking this phone in not possible?
is there another way? if so, how?

Please, please help me. My girlfriend is going to leave me if i keep dumping hours and hours into trying to root this damn phone. It has become a fixation though. I either want to find out how, or hear from a reliable source that it just isn't possible so i can stop trying.

Thank you for reading,

-mr.ffish