[Moto Z2 Force  Questions & Answers] harkoliar:
Hi all,

Would like to thank you in advance in taking your time in reading this post. Its my first time (and post) with the XDA forums. I have a few questions I am not sure if Im doing the correct thing so Im hoping for advice for the experts here in the forum to point me in the right direction.

Technical skills - never flashed a phone before but reading the step by step instructions available in the forums.

A few information with my phone to help with troubleshooting

- Purchased with no warranty overseas because they dont sell it here in the Philippines

- Phone came with the following specs

- Android 8 with Nov 1, 2018 patch

- unlock bootloader

- software channel - retcn

- Build number - OPXS27.109-52-10

- Baseband version - M8988_20207.117.02.41-01.01R NCD

Issue:

1. 4G Network - not working at all on the local network. It seems to be able to go to 4G but cannot make outgoing or incoming phone calls/ text or mobile data.

- troubleshooted by resetting phone, changing apn with no luck. Changing it to 3G only seems to make the phone work to make voicecalls/text and mobile connection

2. Random apps crashing - namely - grab (like uber) and spotify.

- tried resetting the phone (and installed just grab app only after reset but still not working) and cleared partition cache boot mode but still no change.

Proposed solution

- installing a new stock rom - should fix the apps crashing issue and 4g issue

- installing custom rom like lineage (discarded this solution because it will disable audio mods) - i bought the moto mods JBL accessory.

questions:

1. Based on this thread - (https://xdaforums.com/z2-force/how-to/how-to-return-to-stock-sprint-t3694783)

- I wish to install stock rom but Im not sure which rom to use. Do I use USC version based on the phones current build number? - OPXS27.109-52-10 or can I change to a different US carrier like verizon ?(related to next question)

2. Is there anyway to change/fix the carrier frequency so it will start accepting 4g locally here?

- will installing a stock rom with a different carrier (i.e. verizon), will that change baseband and accept other frequencies or will I brick my phone?

- Or hope the stock rom with a different patch will fix it? Ive read in forums it could just be the newer patches that giving me issues. The one available for USC is version OPXS27.109-40-7. Upon checking my local carrier and USC band frequencies, both have 5 band with 850ghz frequency available. So Im beginning to think it could be a software rather than carrier issue

3. Because the phone came with a unlocked bootloader, does that mean I will never receive OTA updates from the stock rom? I will have to manually update it when android 9 comes out?

4. software channel - retcn - does that have to do with anything with baseband or installing stock rom? Does this help in any trouble shooting? Ive seen a few threads in the forums with builds with specific software channel in other threads with specific models xt1789 - 02 or 03 or 06. I dont know if that affects stock roms?

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Maybe it would also help to show my local 4g frequencies and band number

Smart Band is here below

Frequency	Protocol	Class	Band Number

700MHz	FDD-LTE/LTE-A	4G	28

850MHz	FDD-LTE/LTE-A	4G	5

1800MHz	FDD-LTE/LTE-A 4G 3

2100MHz	FDD-LTE/LTE-A 4G 1

2300MHz	TDD-LTE	4G	40

Sorry for some newb questions and I welcome any other methods of troubleshooting or suggestions you guys can give me. I feel installing stock rom USC carrier is the solution to the problem after all the research I have done, but would like confirmation first from the experts.

Regards

Rj