Need help regarding the LTE Bands.

[avijeetpandey87]

I am currently facing a very weird(to me at-least) problem that seems to be exclusive to me, since I cant find similar posts on any forums.

The network of both the sim cards on my phone are continuously being reset- as if I was continuously enabling and disabling airplane mode, but the Wi-Fi, bluetooth and everything else is fine.
I'm using a network carrier called Jio, and have been getting horrible speeds for quite some time now. Today I noticed that whenever I was connected to someone on a call, my internet speeds were exponentially higher(2 mbps - 12 mbps), which seemed strange and after a little research, was revealed to be the cause of my LTE band being locked on band 3 whenever I was on a call.
So I started looking for a way to make that band lock permanent, in hopes of getting good speeds. I found about these two tools called QPST and QXDM which are supposedly have very broad uses like resetting IMEI etc, which I have no knowledge of how to do.
I was stupid enough to not properly read any documentation or proper guides of how these tools are used. I just saw in some articles and videos that QXDM can also be used to directly change the value of the variable that holds the code of what 4g band is being used, so I tried changing that.
Here's the steps I performed:

• 
  Looked for and installed the correct Qualcomm diagnostic mode drivers for my phone(adb and fastboot were already installed).

• 
  enabled DM using adb.( su -> setprop sys.usb.config diag,adb in an adb shell)

• 
  Started QPST and QXDM in that order.

• 
  Selected the LTE values in NV Browser of QXDM and tried to modify those to the codes corresponding to the band I wanted to lock to(band 5 that has code 16).

• 
  I read the default value, copied it, then wrote required value and clicked on "Write" which failed giving the error : "DIAG error received: Invalid Command Error Response"

After this the aforementioned problem started, and I tried restarting the phone first, which sent it into a bootloop.
I fixed the bootloop by clean flashing my current rom(without formatting the storage).
But the problem is still there.
I was using an app to monitor what band is currently being used. Even the app is not working anymore, it says that drivers are not properly installed.
I am also unable to access any network related settings in my rom settings.

My RN7 is a violet.
I am currently on Pixel Experience 10, latest build.
With the latest miui firmware installed.
Orange fox recovery.


I guess I shouldn't have messed with things I have no idea about, specially without proper research, but I am really clueless now about what might be causing the problem and how, if at all, I could fix it, I thought of a complete re-flash of stock MIUI using mi flash tool, but not sure if it would help or not.

Any help will be much appreciated!

 

[gursewak.10]

First of all, you shouldn't have used these tools if root was available as there is an app called Network Signal Guru. Now this app requires root and u can easily lock any of the band you want.
Now if you are facing any problem i recommend a clean install of fastboot rom. With formatting data and storage so none of the problem remains. I guess there is a problem being faced by many though i didn't checked myself about sensors not working on stock rom after pixel exp. Rom but some says flashing miui10 via mi flash and then updating it to miui11 via recovery the sensors strt working.
You need to check for that but if you want to go back to pixel rom then its fine.
To lock bands remember to use this app. It works fine.
Moreover flashing the rom may remove the problem you were facing of signal but i guess it was only due to phone changing bands.

 

[Vishal P]

Network signal guru doesn't work with Custom Roms.

 

[avijeetpandey87]

First of all, you shouldn't have used these tools if root was available as there is an app called Network Signal Guru. Now this app requires root and u can easily lock any of the band you want.
Now if you are facing any problem i recommend a clean install of fastboot rom. With formatting data and storage so none of the problem remains. I guess there is a problem being faced by many though i didn't checked myself about sensors not working on stock rom after pixel exp. Rom but some says flashing miui10 via mi flash and then updating it to miui11 via recovery the sensors strt working.
You need to check for that but if you want to go back to pixel rom then its fine.
To lock bands remember to use this app. It works fine.
Moreover flashing the rom may remove the problem you were facing of signal but i guess it was only due to phone changing bands.

Thanks for the reply, though I agree I shouldn't have tried using things that I don't fully understand.
I did use the app that you mentioned and it did not work, after which I tried this method.
I just clean flashed the miui11 through fastboot using mi Flash tool and it's fixed now, thanks!

 

[Gauche87]

Redmi note 7 pro mobile data dropping

Hello,
Sorry for introducing a new issue(as a new and inexperienced member hoping for solution) related to the mobile data problems on redmi note 7 pro.
I have the phone since a month and the network data was working perfectly fine and since several days the internet via mobile data drops every 5 minutes. I have to reboot the phone or turn off/on mobile data several times.
I contacted my internet provider and all is correct from their side and they even gave me a new sim card that i tested on my galaxy m20 and it works fine.
I was looking for solutions on forums but it didn't help and i turn around here hoping to find solutions on my issue.
Thanks