Last week I first flash KK baseband, then flash CloudyStock by Cloudyfa, upgrading from JB to KK.
If I want to downgrade to JB by kdz, should I flash JB baseband first? Or the JB baseband has already included inside the JB kdz?
By the way, could someone plz briefly tell me the difference between the efs and the modem? As I know, the modem represents the baseband, right?
a0929418971 said:
Last week I first flash KK baseband, then flash CloudyStock by Cloudyfa, upgrading from JB to KK.
If I want to downgrade to JB by kdz, should I flash JB baseband first? Or the JB baseband has already included inside the JB kdz?
By the way, could someone plz briefly tell me the difference between the efs and the modem? As I know, the modem represents the baseband, right?
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Hello! Are you sure you want to downgrade back to stock with a kdz.? You can always flash a stock 4.2.2 rom if you want that (flash jb baseband first) and keep recovery and root...Or you can just downgrade with kdz, no need to flash JB baseband first, it is included inside the JB KDZ.
The Efs partition is a partition where a lot of important radio data is stored. Without this data, you won’t be able to use your phone correctly. So therefore it is important to have a backup of your efs partition, (because it is unique) in case it gets corrupt.Your modem is a part of the firmware that controls the cell and wifi radios inside the phone, so without a working modem, you would not have data, signal, or wifi connection.
Hope this helps!
Norside said:
Hello! Are you sure you want to downgrade back to stock with a kdz.? You can always flash a stock 4.2.2 rom if you want that (flash jb baseband first) and keep recovery and root...Or you can just downgrade with kdz, no need to flash JB baseband first, it is included inside the JB KDZ.
The Efs partition is a partition where a lot of important radio data is stored. Without this data, you won’t be able to use your phone correctly. So therefore it is important to have a backup of your efs partition, (because it is unique) in case it gets corrupt.Your modem is a part of the firmware that controls the cell and wifi radios inside the phone, so without a working modem, you would not have data, signal, or wifi connection.
Hope this helps!
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First of all, thanks your answer!!
I downgrade to 4.2 by flashing JB baseband first, but there's no D802 TWN modem(I live in Taiwan), can I flash other country's baseband(such Hong Kong, or Europe)?
One more question: whenever I downgrade to JB or upgrade to KK, the efs partition won't be changed, while the modem will vary, right? Sorry for my bad English.
The efs partition will never change if everything is as it should be, and yes you can flash other countries kdz. Keep in mind that you might not get 4g connection because the 4g frequency vary in different countries (like 2600mhz, 1800mhz etc)
Btw do you have a backup of your stock jb rom? You can always flash back to that if you have a backup
And yes the modem will vary from kitkat to jb:good:
Keep in mind that I am not responsible for what you do...but otherwise hope this helps
If I downgrade by means of flashing JB modem then JB rom, not by kdz, my question is: if I flash different countries modem, my 4g may not work, right? Besides this, is there any side-effect?
So the only way to get my original modem is to flash my country's kdz, then use tools to backup my JB modem as well as efs?
I never backup stock JB rom, because it's very easy to flash kdz at the first time, while it has been more complicated last few days.
Sent from my LG-D802 using Tapatalk
Who can plz explain to me?
I tied to go back to sotck 4.2.2 by flashing kdz, i did never found my kdz rom d80220a so i tried to flash other country's kdz but it didn't work with me so i'v to reflash kitkat rom d80220a and it work,so basically i cant go back to stock any more, any suggestions?!
Am having this issue from quite a day.I installed lollipop offical firmware provided by blackcat..
i wanted to revert back to kitkat so i flashed stock firmware from sammobile everything is working great except for imei baseband issue please help me.I already tried flashing modems.
Are u have a Backup from your imei and efs?
No brother i do'nt have anything
No solutions yet for those who wish to revert to kitkat.
But a workaround is to use the Lollipop official leaked modem with any kitkat rom.
Heres a link http://forum.xda-developers.com/showpost.php?p=58296174&postcount=2746
ss
But i have reverted back to kitkat :/ problem is imei only :/
TYTY
Ty buddy that modem from lollipop works..
Hi Community,
Phone is GT i9500 - I am in the UK, the phone is unlocked
can you help please. I have just downgraded from Lollipop to Kit Kat via Odin.
All appeared well except that it no longer works as an actual phone!! The Imei is now showing a NULL and Baseband appears as UNKNOWN.
Thanks In Advance
AJ
Here iS the Fix
http://forum.xda-developers.com/galaxy-s4/general/gt-i9500-fix-null-imei-signal-downgrade-t3168137
ajcm.whitfield said:
Hi Community,
Phone is GT i9500 - I am in the UK, the phone is unlocked
can you help please. I have just downgraded from Lollipop to Kit Kat via Odin.
All appeared well except that it no longer works as an actual phone!! The Imei is now showing a NULL and Baseband appears as UNKNOWN.
Thanks In Advance
AJ
Click to expand...
Click to collapse
You need to flash a Lollipop modem. Or you could reflash the Lollipop firmware.
I wouldn't flash the link above you. He has no description at all of the file.
Lennyz1988 said:
You need to flash a Lollipop modem. Or you could reflash the Lollipop firmware.
I wouldn't flash the link above you. He has no description at all of the file.
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Click to collapse
Just as OP, I downgraded to kitkat, in my case because of the terrible battery life S4 gets in lollipop. I have spend days trying to fix this, I have tried all kinds of wipes and ROMs, until I got a decent lollipop ROM and flashed just the modem image, and the problem was fixed!
I thought I had wiped my IMEI, because of the IMEI null and Baseband UNKNOWN issue, but as soon as I flashed the corresponding modem, I "got it back". I do recomend you however, to backup your EFS partition, because apparently you *can* wipe your IMEI when you flash ROMs.
I am on a quite old bootloader and modem as I have not ran any new Roms, or updates to my phone in quite awhile. I was going to try out a new 5.0.1 rom (I am on 4.4.2 now) and was not sure if I would need to update my modem and/or bootloader before I do so.
On SamMobile there is certainly new firmware for my model and carrier, so I was considering flashing the modem and bootloader thru Odin before I try a 5.0.1 rom. Is this recommended/necessary? By flashing a new bootloader, will I lose root or my ability to flash custom roms/kernals/etc?
I tried googling and searching on here first, but could not quite fine the answer. Thank you for any help or guidance.
If you're going to flash a 5.0 touchwiz rom it will update the modem and bootloader I think.
Updating them is not necessary.
People say that flashing newer modems will give you a better signal reception. I have yet to see that "better" signal reception.
You won't lose the ability to flash stuff.
You will only lose root if you flash a stock Samsung rom.
Hi,
I'm currently having a problem with m N910G Note 4. The baseband version is Unknown. This happened after flashing Norma N7 V12 and different bootloaders and modems for Marshmallow (can't find the G1 BL recommended for the ROM). I had a backup for my Lollipop rooted stock ROM, except data. It has Modem and EFS backed up as well so I restored all.
However, I'm stuck with my phone freezing and rebooting (mainly due to baseband issue). I tried loading different bootloaders and modems available for N910G Lollipop but to no avail.
If anyone knows where I can get the COI1 BL and CP, that'd be great so I can still use my backed up ROM. Else, I might have to stick with upgrading to Marshmallow (since that's the only available free firmware on Sammobile). I'm avoiding upgrading the firmware though due to eMMC issues that mostly occured on Marshmallow.
Thanks,
Vin
Flashed RR 6.0.0 Android 8.1. ROM recognizes the bootloader and modem so no more rebooting. I guess the TouchWiz ROM has to match with the bootloader and modem; else it'd keep on rebooting. I'd have to find the bootloader and modem for Norma N7 though, so I hope someone could still reply here. Thanks a lot XDA peeps!