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[Q] Galaxy S3 (GT-I9300) No Service on HSDPA Mode / IMEI lost After Flashing

Hello,
I am Ankit from INDIA.To cut the long story short i just flashed my Galaxy S3 to come back to official 4.1.2. (was running on leaked 4.2.2). after flashing the device i rooted it with CMW to reset flash counter and then flashed again to official 4.1.2.After Flashing the device screen appears No service & IMEI changed to 0049.....
Then i downloaded new firmware from sammobile.com.Now got everything back IMEI is correct have network but am unable to get HSDPA network.phone is working well in GSM Mode but as soon as i chooses HSDPA gets same problem of No Service.
I have tried all the things like EFS backup restore,CSC update etc...But getting network onlyon GSM Mode(Tried with 3 different Sim Cards).
Here is the information about my device
Model GT-I9300 (Internation)
Baseband Version : I9300DDEMG2
Kernal version : 3.0.31-1292854
Build Number :I9300XXEMH4
So help me asap.
Thank You.

Get SIM card and upgrade to 5.11 before flashing? 925T

I have a Galaxy S6 Edge 925T Android version 5.02 and my provider is T-mobile.
Before installing custom ROM should I get a SIM card from T-mobile (mine is too big does not fit) and then upgrade my phone to Stock Android 5.11 via settings page.
OR
Skip going to t-Mobile and just install TWRP bootloader & modem to my stock 5.02. then flash my ROM (XXU2BOFJ V.2.0 Final Lollipop 5.1.1) Then bring my phone to t-Mobile and get a new SIM card.
Thank you

GALAXY925t said:
I have a Galaxy S6 Edge 925T Android version 5.02 and my provider is T-mobile.
Before installing custom ROM should I get a SIM card from T-mobile (mine is too big does not fit) and then upgrade my phone to Stock Android 5.11 via settings page.
OR
Skip going to t-Mobile and just install TWRP bootloader & modem to my stock 5.02. then flash my ROM (XXU2BOFJ V.2.0 Final Lollipop 5.1.1) Then bring my phone to t-Mobile and get a new SIM card.
Thank you
Click to expand...
Click to collapse
Why you don't cut your SIM... ? and them update to 5.1.1... with OTA or donwload your ROM from sammobile.com .... ?

Can't install H3G firmware, keeps soft bricking my phone (SM-G920F)

I have tried to install UK's Three firmware but it keeps failing after hidden.img, I can get my phone back by installing the BTU version (G920FXXU2COH2/G920FBTU2COH3/G920FXXU2COH2/G920FXXU2COH2). Why can't I install the H3G version (G920FXXU2BOG8/G920FH3G2BOG1/G920FXXU2BOGE/G920FXXU2BOG8) ? Will it make a difference if I install the H3G one with reception? WIll my reception inprove? The reason I want to do this is that my S4 has better reception than my S6, so I assume that maybe if I get the H3G version installed the reception will be better. I can't believe that my S4 has better reception.

Yes your reception could get better with a different baseband. But it's not necessary to flash a whole new stock rom for that. The BTU version uses OH2 baseband if I am right and the H3G version uses BOGE? So just find the BOGE modem and flash that

Excellent. I have installed that modem and will check it over the next few days. I know at work I used to get 1 bar of 4G on my Galaxy S4.

You can't install boge because of older version

Quintz said:
Yes your reception could get better with a different baseband. But it's not necessary to flash a whole new stock rom for that. The BTU version uses OH2 baseband if I am right and the H3G version uses BOGE? So just find the BOGE modem and flash that
Click to expand...
Click to collapse
XxM4tzexX said:
You can't install boge because of older version
Click to expand...
Click to collapse
Not sure what you mean by orlder version as it installed fine and rebooted and when I went to my settings it stated that the baseband is G920FFXXU2BOGE so I am sure it worked.

Which baseband version for German S6 Edge to fix missing baseband with UniKernel v8?

Hello,
I have a S6 Edge (Vodafone Germany) and flashed the UniKernel v8-0002 COH9 and kept the stock firmware, the build number is G925FXXU2QOH8.
The phone doesn't recognize my SIM card. After some googling I have found out, that it could be related to the missing baseband version.
I have found out that the newest firmware uses G925FXXU2COH2 modem. I have downloaded and flashed it, but it doesn't change anything.
The baseband version is still unknown.
What did I miss?

QOH8 and COH2 are quite the same firmware. The only difference is that the QOH( is for branded Devices and COH" for unlocked devices without any branding but in Germany there is no such thing as branding. You most likely have an international variant.
Maybe you could try to flash the whole firmware, not only the modem.

Thanks for your fast reply. I found out that my efs partition is corrupted.

Need help with my S6

Hello everyone. I just got an used s6 model SM-G920F
Ive had a few problems. System status is Custom amd when i tap on System Update nothing happens. And why thers an united arab emirates info in settings>about device. The other thing that annoys me is that no matter what network signal the phone is on it displays only 4G even when i choose WCDMA or GSM.
I tried to initialize it it with smart switch but it says device cannot be initialised. The phone is on marshmallow 6.0.1
Another thing that frustrates me is that i am not getting LTE cat 6 signal only standart lte. Should i try flashing a custom rom or stock rom via odin.

Try to flash a stock rom to fix those issues, probably your phone is on a custom rom right now

johnny.goldy said:
Try to flash a stock rom to fix those issues, probably your phone is on a custom rom right now
Click to expand...
Click to collapse
Ok i will. Thanks. But im not too sure. Does the g920f variant have lte advanced.

Try to flash stock rom for your carrier that you are using to have full support from carrier, like wifi calling and volte

johnny.goldy said:
Try to flash stock rom for your carrier that you are using to have full support from carrier, like wifi calling and volte
Click to expand...
Click to collapse
Ok i will

in some Firmwares, the 4G symbol is actually HSPA+, and LTE data is displayed as LTE instead of "4G", but this happens only in certain firmwares, like canadian ones on a G920W8

I cant flash stock rom..

Try custom roms
ZeroFLTE said:
Hello everyone. I just got an used s6 model SM-G920F
Ive had a few problems. System status is Custom amd when i tap on System Update nothing happens. And why thers an united arab emirates info in settings>about device. The other thing that annoys me is that no matter what network signal the phone is on it displays only 4G even when i choose WCDMA or GSM.
I tried to initialize it it with smart switch but it says device cannot be initialised. The phone is on marshmallow 6.0.1
Another thing that frustrates me is that i am not getting LTE cat 6 signal only standart lte. Should i try flashing a custom rom or stock rom via odin.
Click to expand...
Click to collapse
My suggestion would be to try custom rom first, if issues still persist you can always go back to stock rom with odin.