LTE not working in any custom ROM. Tried both SIM slots.

OK, from the day I bought the phone, I was not able to connect to any 4G LTE network.
I tried MIUI (obviously), CM13, Slim, AOSP, etc and was not able to connect to 4G network.
I even used this method to fix LTE issues: Link.
I am currently testing all the ROMs available. Flashed about 8 different ROMs today itself.
Any fixes/workarounds?
Thank you!:highfive:

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