I can't change rom - Verizon LG G4

I bought the handset from LG G4 AT&T and when I activate it on the PC had an update to Android 6.0, after that I upgraded now is Verizon and it gets appearing a message "This sim is not verizon " I have no way to activate it from Brazil , how to remove this ROM and go back to the previous 5.1 AT&T?

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[Q] LG G2 LS980 - Unlock in Brazil

Hello everyone, I'm from Brazil and my brother sent an LG LS980 G2 Unlocked the USA. However, I am unable to use it here in Brazil. Here in Brazil most networks are GSM, including that I have the Sim Card.
When I put my Sim Card in the phone it just does not recognize it, the symbol of the Sim Card appears and the "x" on top. I've tried to unlock it with the method you have here, just that every time Telephony.dat delete a file it back to restart. Currently I am using the version of the software: LS980ZVC - Android version: 4.4.2
Would like to help me as I use to unlock even here in Brazil.
Ps: When I put the phone to get on GSM network, it recognizes all available in my city.
decao15 said:
Hello everyone, I'm from Brazil and my brother sent an LG LS980 G2 Unlocked the USA. However, I am unable to use it here in Brazil. Here in Brazil most networks are GSM, including that I have the Sim Card.
When I put my Sim Card in the phone it just does not recognize it, the symbol of the Sim Card appears and the "x" on top. I've tried to unlock it with the method you have here, just that every time Telephony.dat delete a file it back to restart. Currently I am using the version of the software: LS980ZVC - Android version: 4.4.2
Would like to help me as I use to unlock even here in Brazil.
Ps: When I put the phone to get on GSM network, it recognizes all available in my city.
Click to expand...
Click to collapse
Just flash Cloudyfa ROM and ull be fine or read a forum here is how to unlock LS980ZVC - Android version: 4.4.2 working for your network :good:

Where to download Marshmallow for AT&T G Pad F 8.0 (V495)

I have read that AT&T has released Android M 6.0 for the AT&T G Pad F 8.0 V495 however when I try and update it says I have the latest version. The LG software tool also states the same thing.
I don't not have an active SIM card, but I have tried with a deactivated sim and also no sim with the same results. This update was released 4/26/16 it looks like.
http://www.androidpolice.com/2016/05/06/att-updates-lg-g-pad-f-8-0-to-android-6-0/
https://www.att.com/esupport/article.html#!/wireless/KB426933
I don't know if it's the same with AT&T, but with Verizon devices, they won't receive OTAs unless you have an activated Verizon SIM card in the device. It can take time for the PC software to show the latest update - could be weeks if at all.
I was trying the same thing today on mine and getting the same thing, I remove the Activated SIM from my iPad and installed on my LG G Pad F 8.0 (V495) then I move the date because it check for update every 24H. After all that it found a New Upgrade and download, but my problem is that I am ROOTED and the OTA upgrade wont work on rooted devices.
Ahah, thanks guys. I moved my iPad Mini 4 Sim over with an adapter and was able to update it after it had an active LTE connection.

upgrading sim unlocked g3(D855)?

Recently i purchased a sim unlocked lg g3 D855 from ebay its currently running on android 4.4.2
but my phone was rooted out of the box so no ota
so can anyone in the forums suggest me whether should i install stock android 6.0 or not because if i install stock rom whether the sim unlocked data will be lost or will it still persist.????
thankyou in advanced
If it's unlocked it will remain unlocked.

Can somebody tell me please why updating my unbranded phone branded it?

I should explain, my LG G4 is a H815P, before the update (when it had lollipop) it was brand free and it didn't showed me the image I'm seeing now (I mean the image that is shown when you turn on the phone after the LG's logo), the change happened when I updated the phone from lollipop 5.0 to mm 6.0. Can you guys explain me please...
I did the update with my sim card inside the phone via LG BRIDGE... btw, the image of the carrier that is shown right after I turn on the phone is the same of my phone line which is Claro, I find this extremely weird because I DIDN'T BOUGHT THE PHONE "FROM THEM" I bought it from another store that sold it as a free carrier (or unbranded) phone.
I don't like the image from that carrier showing up, what can I do without voiding my warranty to keep my phone "clean" as before, like re-installing MM unbranded? and how do I do that...pls help
It's probably just something LG put in there, not that your phone is locked. I used to be from a network called MEO (Portugal) and didn't have any branding, but recently I switched the card for a Vodafone and suddenly LG started suggesting me to install apps from Vodafone (didn't get the boot animation tho) because Vodafone is partner with LG. It's probably the exact same thing you are facing right now, just something LG put on there that is activated when using a card from that carrier

Firmware

I bought a carrier unlocked Samsung Galaxy S6 (SM-G920P) online that ran Android 5.1.1. I used it here (not in NZ) and I wanted the Android 7.0 Nougat update but I couldn't update it OTA due to the fact that my phone was supposedly running on a custom software. So I flashed the (SM-G920P) 7.0 Firmware for Sprint but now I can't detect my mobile network. Also on the back of my phone, it says at the bottom "SM-G920R4". What do I need to do to get my mobile service again? A carrier unlocked phone can't lock again right?
If I'm correct, the g920r4 is on US Cellular

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