J7 MetroPCS, is there a no-carrier stock ROM available? - Samsung Galaxy J7 Questions & Answers

I'm thinking of getting the J7 MetroPCS version since they have it for free when porting in.
Assuming after 3 months, the phone will be SIM unlocked, I need the stock (non-MetroPCS version) hotspot feature to use it with Freedompop. My Verizon S7 Edge is flashed with 935U ROM and I'm wondering if there's a similar ROM for the J7. If not, what is the best option to use tethering + root?
I'm currently using a SIM unlocked MetroPCS HTC 626s's hotspot feature that's built in the latest ROM and it's working nicely with Freedompop AT&T SIM. I have it rooted to automate some tasks such as starting the hotspot and turning it off.

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[Q] Current 4.4.4 rom that works with XT1030 and fixes 'LTE bug'?

Recently I started using a Droid Mini which is now unlocked and rooted with stock Verizon 4.4.4. SU4.21.
I like kitkat for now and could even live with the stock rom, maybe with xposed/gravity, but I just discovered the 'LTE bug' which prevents use of sms/voice on LTE on a non-verizon service. I disabled LTE and everything works fine but I would prefer to get LTE working properly with 4.4.4.
If there is still no fix for the LTE bug with stock 4.4.4, what is a good working kitkat rom that solves the problem? Topsnake's 4.4.4, CM 11, or one of the Moto X ports? I read another XT1030 user say he was using Krypton Moto X port now but I am assuming for the XT1030 you need specific audio, screen size or other patches?

org.simalliance.openmobileapi support

I am using stock root 5.1.1
I want to know if there any rom has org.simalliance.openmobileapi??
since I want to use NFC Sim in my country

SM-G935P (Sprint) S7 Edge rooted 6.0.1 to rooted 7.0.0?

Hello, I'll jump right in;
I'm wondering if it's possible to go from rooted 6.0.1 to rooted Nougat 7.0.0 (superman rom or something) without having to go back to the stock firmware in between.
So to be perfectly clear:
I have 6.0.1 SM-G935P ROOTED
And I'm trying to get to:
7.0 (nougat) SM-G935P ROOTED
And I want to know if you can skip updating to OFW 7.0 and skip straight to CFW 7.0
(old PSP terminology: OFW official firmware/CFW custom firmware)
Phone info:
Baseband G935PVPu2APE1
Build MMB29M
Model SM-G935P
Android V 6.0.1
EDIT:
Is 7.0.0 only for unlocked phones? If so, is it possible to unlock my version/model and will I still be able to use my Sprint network with an unlocked phone? Thanks guys!
Edit #2:
Also, is there a list of custom roms for specific devices anywhere? Or would any custom rom made for S7 Edge work on any S7 Edge? I'm trying to get substratum working and it says I need a rom that's compatible with OMS and Masquerade.

VoLTE with custom roms

Would someone knowledgeable on rom development please be kind enough to explain why VoLTE is not yet supported in most custom roms? It's quite a frustrating issue for those of us that require VoLTE for various reasons. Why is VoLTE missing from custom Verizon capable roms? I personally own the SM-N910V Verizon Samsung Galaxy Note 4 and HD Voice does work with a couple Samsung TW based roms, but that means being stuck on 6.0.1. No Nougat or Oreo. So frustrating! Thanks.

VoLTE with custom roms

Would someone knowledgeable on rom development please be kind enough to explain why VoLTE is not yet supported in most custom roms? It's quite a frustrating issue for those of us that require VoLTE for various reasons. Why is VoLTE missing from custom Verizon capable roms? I personally own the SM-N910V Verizon Samsung Galaxy Note 4 and HD Voice does work with a couple Samsung TW based roms, but that means being stuck on 6.0.1. No Nougat or Oreo. So frustrating! Thanks.

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