Can't seem to get 4G after RUU installation - One (M8) Q&A, Help & Troubleshooting

Hi!
I purchased my M8 recently and it came with Android 4.4 and didn't update so I installed marshmellow directly in it using a RUU. The installation was smooth but since after I can't seem to get 4G on my device even though it used to work.
Any help will be appreciated!

Check your settings, maybe 4g is disabled or you don't have the correct apn.

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I recently used mytouch_slide_factory_nandroid to unroot my phone back to factory. However, when it recovered it did with the old 1.27... software version. I tried using the OtaPkg.zip to update to current version, but keep getting the verification signature error and it aborts.
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I am not sure this will help but you might find the answer to reverting to the original ROM here http://forum.xda-developers.com/showthread.php?t=834521

[Q] Installing ROM

DEVICE HTC one X
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Hello XDA World,
Wonder if someone can help me. Recently I tried to install a custom ROM of KitKat on to my android device. It got stuck in a bootloop and did not work. with restoring my backup somehow got curruptted or I made a mistake along the way and got a new handset.
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[Q] Boost Samsung GS3

Hi all,
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Can't connect to network after restoring LG G2 LS980 to stock

Hello,
I followed this guide to restore my sprint LG G2 to stock Kitkat 4.4.2. Everything went fine, the phone is working, the only problem I have is that I can't connect to any network. The phone is not recognizing any of the local network providers. I bought this phone on ebay and it came with a custom rooted rom installed on it, so I decided to "clean up the mess" and restored stock kitkat. As I mentioned before everything went fine, but the network is not working (it was working with the android version before i restored stock 4.4.2). Maybe its because I'm not living in the USA (I'm from Bosnia/Europe). Should I flash a different radio on it? The phone is updating atm with OTA and I'm pretty sure that the updates wont help. Did anyone else had these issues? Any help would be highly appreciated.
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Update 2: I just reinstalled "cm-12.1-20151031-NIGHTLY-ls980" Lollipop 5.1.1. and it had no problems to find all the networks in my area, so this clearly has to do with stock LG android 4.4.2.
When you say you can't connect to network, are you referring to your mobile carrier network, or like WiFi?
If it's your mobile carrier that you can't connect to, you might need to switch your radio. Take a look at this guide and the section about using radio switcher: http://forum.xda-developers.com/sprint-g2/help/how-sprint-lg-g2-ls980-to-t-mobile-t3230685
Fuzz1303 said:
When you say you can't connect to network, are you referring to your mobile carrier network, or like WiFi?
If it's your mobile carrier that you can't connect to, you might need to switch your radio. Take a look at this guide and the section about using radio switcher: http://forum.xda-developers.com/sprint-g2/help/how-sprint-lg-g2-ls980-to-t-mobile-t3230685
Click to expand...
Click to collapse
Hey there. Sorry for the late response. I kinda gave up on making the stock LG ROM work, which is why I kept on using CM12.1 . What I was referring to was my mobile carrier. The phone has no problems connecting to any WiFi signal.
I didn't try to flash any radios at all after restoring the LG G2 stock ROM. Maybe I should have tried one of the radios from this CM12.1 for LG G2 tutorial. Here is a direct LINK to the full list of LG G2 radios, where I downloaded the radio for my phone. I'm not sure if the other LS980 Radios would work on my device. There are 4 different radios available for the LG G2 LS980.
Do you think flashing one of these radios would help solving this problem after restoring the LG stock ROM?

HTC One M8 carrier/signal problem after stock rom install

Hi there.
I've got a SH Htc One M8 from someone. All that i know about the phone is that it had Android 4.4.4 version when i got it. I managed to upgrade the software to 5.1. But I read that Htc One M8 can be upgraded to 6.0 version. I couldn't do it (software is up to date message), so i went to a service and asked then to do it. After i got it back, i saw that when i start the phone, a Sprint logo is showing which was something new. After some time i found here updates to 7.1 (crdroid, aosp or aokp....) and they worked fine. (didn't notice the signal problem). But i love very much Sense Home so i wanted to get back to 6.0 stock version. I didn't knew anything about CID, MID, hboot then... After some reading, i managed to install 6.0 version with CID from Sprint. The problem is that my phone is LTE capable (should work over 4G network) but as i can see, it works only with GSM/UMTS Only (I still don't know if i got these right)... Also, I was traveling from Romania to Holland and in Holland i was able to make phone calls but i wasn't able to use mobile data as i could in Romania. Everything works fine if I insert SIM in another phone from Holland so its not the SIM/Carrier. All settings are ok in the HTC (roaming, data in roaming...) so the phone is ok. I out of ideas. I don't know the original CID and MID. The charger that came with this phone was english. Any ideas?
So what you are saying, is that you can't get LTE (4G), but you aren't sure whether you had 4G on the custom ROMs (CRDroid, AOSP, etc.) or not?
redpoint73 said:
So what you are saying, is that you can't get LTE (4G), but you aren't sure whether you had 4G on the custom ROMs (CRDroid, AOSP, etc.) or not?
Click to expand...
Click to collapse
Well, i wrote a lot of details.... The issue is that i couldnt use mobile internet in other european country. And i dont understand why i cant use LTA/CDMA network mode nowhere even if my phone is capable. Could it be the Sprint OS?
I remember having a similar issue and ended up reverting back to sense os myself
Sent from my KFFOWI using Tapatalk
byonykx said:
Hi there.
I've got a SH Htc One M8 from someone. All that i know about the phone is that it had Android 4.4.4 version when i got it. I managed to upgrade the software to 5.1. But I read that Htc One M8 can be upgraded to 6.0 version. I couldn't do it (software is up to date message), so i went to a service and asked then to do it. After i got it back, i saw that when i start the phone, a Sprint logo is showing which was something new. After some time i found here updates to 7.1 (crdroid, aosp or aokp....) and they worked fine. (didn't notice the signal problem). But i love very much Sense Home so i wanted to get back to 6.0 stock version. I didn't knew anything about CID, MID, hboot then... After some reading, i managed to install 6.0 version with CID from Sprint. The problem is that my phone is LTE capable (should work over 4G network) but as i can see, it works only with GSM/UMTS Only (I still don't know if i got these right)... Also, I was traveling from Romania to Holland and in Holland i was able to make phone calls but i wasn't able to use mobile data as i could in Romania. Everything works fine if I insert SIM in another phone from Holland so its not the SIM/Carrier. All settings are ok in the HTC (roaming, data in roaming...) so the phone is ok. I out of ideas. I don't know the original CID and MID. The charger that came with this phone was english. Any ideas?
Click to expand...
Click to collapse
Try searching for Network Operators, and then create a new APN: T-Mobile US, fast.t-mobile.com, with APN type: default,supl,mms. I deleted and recreated the APN and my mobile data started working again. Creating new seems to work better for me than the default after reset.

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