De-branding ATT Lumia 640 and Flashing T-Mobile ROM

I just registered and if this question is not OK or in the wrong place, let me know.

I read two earlier tutorials here how to do the above job and
in my judgment this is not something I feel competent to undertake myself.

How would I go about finding somebody reliable that does this stuff for a living and roughly how much should it cost?

Thanks.

Debranding a HTC Desire 510

Ive got a htc desire 510 that already has S-Off but its branded to 3, its unlocked already too, just branded to 3. Im not too worried if i screw it up as i only paid a tenna for it. Ant help with this one would be very much appreciated. Thanks in advance guys

Huawei Mate 8 NXT-CL00 (Unlocking and Debranding Help...)

I bought the NXT-CL00 variant. From which I understand is locked to China Telecom.
I found a site that will unlock the phone for me. But then a problem still exists, and that's with the sim card. Apparently you will get 2G speeds in either sim card slot, unless you debrand.

I want to use this phone on any GSM carrier [In this case AT&T and China Mobile], at full data speeds.

Can someone give me step by step instructions on how to debrand my phone. To make my NXT-CL00 use full 4G data speeds?

S7 Vodafone: Debranding DBT german

Hello!

I have a SM-G930F from Vodafone (germany).
I'd like to flash a original branding free firmware (DBT). I don't wanna have root or so!

Which firmware should i take ?

At the moment i have:

CSC: G930FXXU1APF3
PDA: G930FXXU1APF3

Thanks anyway :)

Regards
Akusari