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[Q] Is baseband and kernel and android version important when flashing ?

hello,
When flashing ROM should we check previous OS baseband, kernel version and androidn version ?
I heard from my friend that you cannot flash older andriod version on previous version such as installing 2.3.3 on 4.1.2. Also, he said that baseband much match the new ROM otherwise the phone will be bricked. Is this true ?

mr.ab18 said:
hello,
When flashing ROM should we check previous OS baseband, kernel version and androidn version ?
I heard from my friend that you cannot flash older andriod version on previous version such as installing 2.3.3 on 4.1.2. Also, he said that baseband much match the new ROM otherwise the phone will be bricked. Is this true ?
Click to expand...
Click to collapse
Your mate doesn't know much. You can flash any firmware, old or new so long as it is for that phone.
You can also mix and match modems and kernels, also so long as they are for that phone model.
No phone I know of has gone from 2.3.3 to 4.1.2 unless the 4.1.2 was a custom firmware. Even so you could still flash it back to an older firmware in odin or even cwm recovery (depends).
It's quite rare that a modem will cause a problem but it has happened. For instance on the S3 the baseband was updated at one stage, so that using an older baseband on newer firmware resulted in no outgoing call sound. But that was an easy fix. Just needed to relash a newer modem.
I only know of one instance where flashing a certain kernel on a certain rom caused a complete brick. That was on the S2 with one firmware version I believe.
Finally, if you are thinking of flashing and don't have much experience, my advice is read read read until your eyes burn. This forum is a good starting point.
Sent from my GT-I9505 using xda premium

Galaxy S4 without network signal. Please help.

First, I have a Galaxy S4 i9505 (4G), the problem does not affect my device, but the device's my cousin who is a Samsung Galaxy S4 i9500 (3G).
He recently purchased the unit from another person, the unit worked well, but had a small defect in the charging connector ...
He asked me to sell one of my cases and battery why his battery was apparently bad, why was not possible give loads on the battery, I managed to solve this problem.
The problem came when he asked me to update the device to Android 4.4.2 KitKat by several improvements, I downloaded the latest firmware available at SamMobile site and after that did the flash using Odin.
Knox had in 0x1 (the unit had been modified) and I read on some forums that night, that when doing upgrade directly from 4.2.2 version, especially XXUBMGA the EFS partition changes shape, thus having little network problem and signal.
Link : http://www.grupoandroid.com/topic/83400-modem-mg9-y-posteriores-modifican-la-efs/
My questions are, it is possible to resolve this situation? I read previously that the IMEI is restored from a backup made previously it is possible to recover the network signal, but made no backup of EFS ....
I also read a long time ago that it is impossible to downgrade to ROM's with lower versions if there Knox installed.
I did the update of Android 4.2.2 to 4.4.2 using Odin.
If possible downgrade, any of you can share the ROM XXUBMGA 4.2.2 for S4 i9500? Or tell me some possible solution installing another ROM / modem?
I am currently trying different modems and using the OmegaROM in my cousin's S4.
Thx

Extract the modem.bin file from the ROM download and flash that through Odin to correct this. Or simply flash the ROM itself again if you don't want to go through the hassle of getting just the modem file out of the download. Either option will restore the network.
The IMEI in this case likely has nothing to do with the problem you're having, unless the IMEI reports itself as null or starts with 049. If you want a proper backup of the IMEI, you want to download AntaresOne's backup tool from the I9505 Development subforum and follow his instructions to make the backup.

G900FQ Stock 6.0.1 Installation [PLS HELP ME!]

Hi There,
First, I apologize for my bad english .
My device is G900FQ but but it works for all custom ROMs produced g900f .
So the only difference between the country code and G900FQ g900f.
previous method : when I install android upgraded 1/272 , finish and bootloop .
The second method : bootloop.
Can someone help me so I want to install ?
I love this type of thing. but somehow I could not .

In the thread which contains the 6.0.1 stock rom it is specifically pointed out that the rom is ONLY for g900f so why would you try it? The developers have clearly said that the rom will not run on any other variant. So please read before questioning.

Hbk6699 said:
In the thread which contains the 6.0.1 stock rom it is specifically pointed out that the rom is ONLY for g900f so why would you try it? The developers have clearly said that the rom will not run on any other variant. So please read before questioning.
Click to expand...
Click to collapse
I want to say , I can not in any way to install device? Is there no solution?
I just want to say just there to help me .

Read the warnings, 6.0.1 is ONLY for the G900F
Stop asking for other models, it will BRICK YOUR PHONE
Or, go ahead and try it, but don't make a new thread asking how to fix your broken phone
This is a STOCK ROM, not a custom, BIG DIFFERENCE
BOOTLOADER

My Device is : G900FQ
G900F 4.4.2 Stock Rom ( Odin ) : Work
G900F 5.0 Stock Rom ( Odin ) : Work
G900F 6.0.1 Stock Beta Rom : Doesn't work.
very absurd.

Bootloader and modem question

Hey I want to install Lineage OS on my S5 G900F. I had this rom not long ago but I remember I had random reboots. I don't really understand how the bootloader and modem works ( I've read other threads before opening this but I'm not sure what to do so it's best to ask instead of breaking the phone ;D). If I will have android 7.x which bootloader and modem should I install? The latest and if yes where can I get download for those (I saw there is an option to extract it from official rom but the official one is version 6.0.1 so I'm not sure what to do).
If anyone can clear my misunderstanding and help me I will be glad, Thanks!

oreltal95 said:
Hey I want to install Lineage OS on my S5 G900F. I had this rom not long ago but I remember I had random reboots. I don't really understand how the bootloader and modem works ( I've read other threads before opening this but I'm not sure what to do so it's best to ask instead of breaking the phone ;D). If I will have android 7.x which bootloader and modem should I install? The latest and if yes where can I get download for those (I saw there is an option to extract it from official rom but the official one is version 6.0.1 so I'm not sure what to do).
If anyone can clear my misunderstanding and help me I will be glad, Thanks!
Click to expand...
Click to collapse
I am not using it but on the official LineageOS thread they recommend bootloader+modem combo from the latest available stock firmware which is android MM 6.0.1 of course.
You can get them for example from here (newest ones are: BL - CQI6, Modem - CQA9).

Thanks for the replay in the end I went back to stock rom and reinstalled lineage OS. Phone runs smooth and no crash until now. I think my problem is solved.

Installing g900f official rom on g9006v

Hey everyone
summary :
how can i install a rom file for sm-g900f on sm-g9006v ? with altering the rom file or my phone.
notes:
-they have exactly the same hardware but one is china version
-phone originally had android 5.0 and every where on its back and case says its g900f
the phones ''about device'' said g900f too
full version :
i bought a s5 (g900f) a couple of years back, but it didnt receive the 6.0.1 update like others, so now i decided to update it manually using odin.
but in download mode its version was g9006v
so i found the android 6.0.1 rom for it and installed it using odin
but unfortunately it doesnt have any of the google services and has a couple of system apps that cant be deleted of disabled and they are draining the battery.
so now i want to go back to international 5.0 or 6.0.1
considering that both versions have the same hardware and that somehow it had g900f rom on it before
i was wondering how could i adjust my phone or the rom file (tar) to install it.
thank you for ur help
here is my email:
[email protected]