[Completed] No signal after flashing rom - XDA Assist

Hello.
This is not an urgent issue sincee i have set up voip alternatives, but id' like to see it resolved anyway for curiosity and convenience/payment reasons. So here's the deal. i'm on a rooted g3, with cloudyfa's lollipop rom and the latest version of twrp. the device was ATT unlocked, and I intended to use it later with a tracfone sim card on the byop program. anyway, after flashing the rom i didn't get any signal bars at all anymore. i tried reflashing the kitkat [At that time i downgraded to 4.4.4again and lost signal], lollipop broadbands for my device, the latter even also being released by cloudyfa. i tried goping into the network settings and, since apn's are out of my range, just searched for service providers. i tried everything and still nothing. yet when i downloaded an app to manage my voip, it said my signal was great. what is this?Can my phone still be saved?

XDA Visitor said:
Hello.
This is not an urgent issue sincee i have set up voip alternatives, but id' like to see it resolved anyway for curiosity and convenience/payment reasons. So here's the deal. i'm on a rooted g3, with cloudyfa's lollipop rom and the latest version of twrp. the device was ATT unlocked, and I intended to use it later with a tracfone sim card on the byop program. anyway, after flashing the rom i didn't get any signal bars at all anymore. i tried reflashing the kitkat [At that time i downgraded to 4.4.4again and lost signal], lollipop broadbands for my device, the latter even also being released by cloudyfa. i tried goping into the network settings and, since apn's are out of my range, just searched for service providers. i tried everything and still nothing. yet when i downloaded an app to manage my voip, it said my signal was great. what is this?Can my phone still be saved?
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Greetings,
Thank you for using XDA Assist.
First, have a look at your device's homepage found here:
AT&T LG G3
Most of the helpful guides and information you need can be found in the General Forum located there. If you create an XDA Account, you can post your questions in the Q&A forum also located there.
Good luck and welcome to XDA!

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Unable to connect to mobile networks

Greetings, I have created an account in order to seek help directly.
I received a LG P920 phone already rooted on ICS 4.0.4
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http://forum.xda-developers.com/showthread.php?t=2228269
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I'm at a loss right now, most of the guides I've seen here are for different purposes other than just getting the mobile networks going.
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[Completed] Help!! Galaxy J100H not registered on network.

Greetings, sharing here my particular problem from top to bottom just to take advice in general.
First of all, I live in Cuba, so my one and only network is Cubacel which runs GSM 900 mhz, so far so good with most phones.
I am between phones so I boorrowed this used J100h from a friend, which received it as a gift and has never been used. I performed a hard reset to wipe password, data, etc. Phone boots ok but no calls with cuban SIM.
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Hi !
I see plenty of firmwares on samsung website so pick one and see how it works , it doesn`t matter the region , you won`t damage anything , maybe the modifications that has been made on the device borked the network , clean stock firmware flash may resurrect it and try the one which matches the bootloader
You may have a look here as well https://forum.xda-developers.com/android/development/rom-gennxt-prerooted-stock-t3126368
Good luck !

Can't connect to any cellular network anymore SM-G920F

Hello, I can't connect to my local mobile network anymore.
So I can't call or receive phone calls.
I am in Latvia, Baltic region.
My imei is legit and working, so is my phone number.
When I search for my mobile network it finds it -LV TELE2, easy, but when I attempt to connect to it, it shows it 'can't connect to this network try later', when of course the network is working properly for other phones., and it is the network that worked before.
I happened after I flashed a custom lineage rom. It was the right rom for my device,
and I flashed it in correct order and all worked except mobile networks.
I thought using odin to flash back the stock rom will fix it, but it didn't.
Now I am back to stock 7.0 , flashed csc SEB version for my region.
Now in mobile networks there is only Lte/2g/3g options, why there is no gsm or vcdma mobile service?
I believe my provider is gsm, so how to restore it so I could call again?
It shows no service in the drawer, and can't connect to my carrier.
Any help is greatly appreciated, thank you ^_^)/
Had same problem after my motherboard was changed in some mobile repair shop and old imei and stuff copied from old motherboard. After flashing stock 7.0 with ODIN, I had same problem. Luckily repair guy added some certs back free of charge. Something to do with not being official Samsung repair place and not having right kind of tool.
Sent from my SM-G920F using XDA-Developers Legacy app
Thank you for your info. Then it must be possible to fix it with the right tools even at home! I am sure there must be someone who knows how to do it and can help me, and many others with the same problem.
When you tap *#0011# imei status is OK or NG?
Hello, I typed *#0011# and yes imei status is ok, more info - rat=gsm (2g), band=pgsm900 and reg status is = not registered.
So this couldn't be an imei problem, could it?
During this time, I tried many roms, nougat and marshmallow, official and custom, but none has fixed it yet.
I was thinking, flashing original galaxy s6 lollipop rom will definitely do the trick,
because I remember I had a similar problem with my old galaxy s plus phone,
it was impossible to connect to any mobile network on any rom,
until I flashed the oldest stock rom for the device.
But the problem is, I can't find a working download for a custom lollipop rom, they are extinct it seems,
and the official lollipop rom can't be flashed with odin, obviously, because I have a higher fw already.
Official lollipop would be the best and would show if the problem is software related for once and for all,
but how to install it when knox and all kinds of binaries doesn't allow me to flash it with odin?
Is there another way to do it?
No need for this anymore, never solved the issue.
I sold the phone.
Thanks anyways ^-^)/

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