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can Samsung KIES, firmware repair tool revert 5.1.1 Roms to stock 5.0.2 ?

Can the official Samsung KIES Flash tool program correctly flash 5.0.2 software back onto my phone
after I install a 5.1.1 Rom?
Everyone says you can not return to 5.0.2 rom after flashing a 5.1.1 rom.
is that 100 % correct ?
the Japanese softbank sm925Z Galaxy s6 Edge is still 5.0.2. it never recieved a 5.1.1 update.
I want to try to find a 5.1.1 rom for another country. but I do not know if the official samsung KIES flash tool
can return me to stock 5.0.2 , if the 5.1.1 fails to connect to wifi and cellular.
is there a way to backup my modem-imei-efs information, and import that to new ROMS ?
I have tried other 5.0.2 roms, and all of them lose access to the wifi and cellular service.
Should I abandon all hope on roms with the japanese sm925z?
or is there an option I dont quiet understand yet?
I have backed up my stock rom and efs partition with rooted twrp 2860.
but replacing the EFS partition ontop of new ROMS does not seem to resolve the wifi - cell service issue.

I thinks the answer is no.

Kies, no.
ODIN, maybe

It should or ODIN should because you are not updating the bootloader.

Signal loss with a Moto G 4G XT1039

Hi everyone,
First, thanks everyone for all the information I have found in this forum for the past few weeks.
Now my problem : I have a Moto G 4G XT1039 that keep losing signal randomly. The only way to get my signal back to call or receive sms seems to be a reboot of the phone.
I don't remember exactly when it started but I think it was around June. Until a month ago I never tried to root or flash my phone. I just used the official updates from Motorola. I live in France and the phone is perfect for me except this problem.
I read here and there that a lot of people seems to have the issue but I'm surprised nobody seems really pissed of.
I downgraded to 4.4.4 to see if it would solve my problem but it did not. I read that the signal loss could be caused by Android 4.4.2 so should I downgrade further ?
This weekend I flashed a nightly from CM 13, the problem is still here.
What can I do ? The problem seems to be related to the radio firmware, can I downgrade the radio firmware and keep a recent android or CM13 ?
For information my baseband version is m8926_309101.02.03.14r.
I'm not sure I post my problem in the good forum but it could help other people in my situation.
If someone has an idea....
Thanks

Firstly try the Stock ROM and Radio Firmware available here: http://forum.xda-developers.com/moto-g/4g-development/rom-stock-motorola-4g-lollipop-rom-t3142816 - follow flashing instructions to the letter - after this you can move on to CM13 if desired.

Well I have already done that, after I tried the 4.4.4 version.
I was on 5.1 then I downgraded to 4.4.4 then got back to 5.1 then tried CM 13.

RadiNash said:
Well I have already done that, after I tried the 4.4.4 version.
I was on 5.1 then I downgraded to 4.4.4 then got back to 5.1 then tried CM 13.
Click to expand...
Click to collapse
Did you fastboot flash the Radio Firmware from that thread? Commands are in FAQ.

Yes I did. I event tried to flash the 5.1 radio firmware while still having the 4.4.4 android.
The baseband version I gave in my opening post is the last one for the EU region I believe.

Other Solutions to try:
1) Change SIM card / get a new SIM
2) Fastboot flash the Stock Factory Firmware Image for your phone - http://forum.xda-developers.com/mot...falcon-factory-firmware-t3110795/post64203816

Thanks, I was going to order a new sim card to try this solution.
I already flashed the latest stock firmware last week but i will try again from scratch to be sure.

Provide fastboot logs (copy and paste command prompt) when flashing the firmware image. Fastboot may not provide errors, "okay" can mean total failure.

Hi,
Just to say that there is apparently no more signal loss with the CM13 nightly from 12/11. I hope it will last.
In the end I didn't flash stock firmware.
Thanks again for your suggestions, I will come back if the problem is back.

Lost IMEI and baseband numbers after flashing custom software. Help with restoring.

Hi, I flashed xtrestolite on my phone and after booting up both my imei and baseband numbers became unknown; I now can't connect to my mobile network as my phone doesn't detect my sim.
I've tried to fix this issue by flashing other roms as well as flashing various official firmwares downloaded from sammobile to no avail.
I remember having the same issue with my gs3 and fixed it by flashing cyanogenmod. I tried this as well but the phone wouldn't boot up after flashing the unofficial version.
Could someone please help me with fixing this as I've been trying to for 3 weeks now.
Device: s6 edge g925f (vodafone uk) 6.0.1

aabojang said:
Hi, I flashed xtrestolite on my phone and after booting up both my imei and baseband numbers became unknown; I now can't connect to my mobile network as my phone doesn't detect my sim.
I've tried to fix this issue by flashing other roms as well as flashing various official firmwares downloaded from sammobile to no avail.
I remember having the same issue with my gs3 and fixed it by flashing cyanogenmod. I tried this as well but the phone wouldn't boot up after flashing the unofficial version.
Could someone please help me with fixing this as I've been trying to for 3 weeks now.
Device: s6 edge g925f (vodafone uk) 6.0.1
Click to expand...
Click to collapse
The phone originally for vodafone uk and you flashed the latest firmware on it?. I think nothing can be done except restoring the imei from backup manually.
Sent from my SM-G925F

Rosli59564 said:
The phone originally for vodafone uk and you flashed the latest firmware on it?. I think nothing can be done except restoring the imei from backup manually.
Click to expand...
Click to collapse
The phone was on version 6.0.1 and I flashed the same firmware versions. I deleted the backup of the original firmware unfortunately. So does this mean that nothing can be done to fix the phone?

aabojang said:
The phone was on version 6.0.1 and I flashed the same firmware versions. I deleted the backup of the original firmware unfortunately. So does this mean that nothing can be done to fix the phone?
Click to expand...
Click to collapse
Try reinitialize the phone using smart switch. Hopefully it could fix the broken imei. Flashing the correct firmware(odin/smart switch) sometimes helps to restore imei.
Sent from my SM-G925F

Rosli59564 said:
Try reinitialize the phone using smart switch. Hopefully it could fix the broken imei. Flashing the correct firmware(odin/smart switch) sometimes helps to restore imei.
Click to expand...
Click to collapse
Thanks I'll try that when I get home from work.

[Completed] Have signal but not registered on network

I have Samsung Galaxy S3 GT-I9300. When the google drive app was downloading from google play, my phone went off due to poor battery. Later when I tried to turn it ON, it has been getting stuck in the boot. So I decided to reinstall my custom ROM. Being busy with my baby, toddler, household chores and job, I gave it to my brother to flash the ROM. After a while, I noticed that my sim was bricked.
It says "Emergency Calls Only", has fake IMEI but working signal.
We did not backup the efs. I tried searching all the methods like modem installation, CSC, baseband verions, IMEI re-write, Kies Upgrade and Initialization, other people's efs restore, etc. But the problem is unchanged. Some of the followed method might have failed for not having proper knowledge like IMEI re-write tool works on specified chipset, etc.
What we noticed is that using different baseband version toggles from having network signal or no signal.
Kies shows more than four firmware versions and no other details like CSC, etc.
How do I clean up all these especially to have SIM working on my phone?
I appreciate you assistance to be brief and clear to understand steps than sending links. Because my time is stress-fully short.

Hi !
There is some confusing info in your post
What do you mean with it has fake IMEI " ? Have you changed it ?
You say that you have a working SIM on certain basebands , is this happening on a custom rom or stock ?
Have you tried to flash a stock firmware as I see that you tried to flash "your custom rom " ?
Cheers !

First of all, thank you for your response and interest to assist.
My mobile's IMEI is shown as 004999010640000 which is not original. Can you help me to change it to correct IMEI suitable for my Samsung S3 GT-i9300 chipset, if that helps in enabling sim to connect to a network? I think changing method only masks the IMEI?
I have tried flashing stock firmware and also Kies Upgrade and Initialization.
I have also changed baseband version installation on stock ROM too. I don't know which baseband is correct to keep.. for my country India or in the country where my mobile is manufactured, incase that's locking sim accessibility? Some baseband bought signal and detected the network operator name, but the message still says "Emergency Calls Only" and is unable to connect to a network.
I presume this problem arose when installing custom ROM from TWRP recovery and it messed up with efs partition?
I had successfully flashed custom ROM many times before without this problem. I think there's some next step to follow to bring back the working sim like I heard of installing modem. I did just try installing modem but same problem as my baseband is already bringing signal.
I had tested my phone from sim unlock app and found out that CSC is locked and it limited specified MCC and MNC numbers. Is this hindering connection to Indian mobile network? Or corrupt efs? Or missed to manually install something?

Bump.

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 ^-^)/