Installing the MJB Official bootloader and modem, can we still install custom aosp roms?
You should have no problem installing custom ROMs. I have an i747m with a 4.1.2 bootloader and have loaded a few KK ROMs with no problem.
Yea you shouldn't have any problem installing Roms on mjb just make sure that the ROM you install does not install a downgraded bootloader or you will brick the device......also if a ROM uses the ne4 bootloader you will be stuck using the ne4 modem
No rom should ever include anything but the system and kernel imo. Ive personally never run into one that includes the firmware/bootloaders, but if you do you should bring it up to the dev.
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I am thinking to flash a 4.4 ROM on my S3 I747M. The only thing I am worried about the bootloader. If I flash the latest boot loader can I downgrade it?
Here a scenario
I am on 4.4 kitkat,with the latest bootloader,and I decide to go back to 4.2.2 with the latest bootloader. Is it possible to do that?
xXFl4sh said:
I am thinking to flash a 4.4 ROM on my S3 I747M. The only thing I am worried about the bootloader. If I flash the latest boot loader can I downgrade it?
Here a scenario
I am on 4.4 kitkat,with the latest bootloader,and I decide to go back to 4.2.2 with the latest bootloader. Is it possible to do that?
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What carrier do you use? If AT&T is it the MJB bootloader.
You can check what bootloader you having using this - https://play.google.com/store/apps/details?id=org.freeandroidtools.root_checker
If you are on AT&T with the MJB bootloader you CANNOT downgrade the bootloader. It will brick the phone. My guess is that you could possible run a 4.2.2 ROM with the MJB bootloader. I have run 4.3 and 4.4 on the MG2 bootloader with no problem but haven't tried to run a 4.2.2 on the MJB bootloader. As long as the 4.2.2 ROM doesn't flash a bootloader, I would try it. But that's me. Just back sure to have a current backup. If there are any doubts about the 4.2.2 ROM flashing a bootloader, don't do it if on MJB.
xXFl4sh said:
I am thinking to flash a 4.4 ROM on my S3 I747M. The only thing I am worried about the bootloader. If I flash the latest boot loader can I downgrade it?
Here a scenario
I am on 4.4 kitkat,with the latest bootloader,and I decide to go back to 4.2.2 with the latest bootloader. Is it possible to do that?
Click to expand...
Click to collapse
most 4.3 aosp roms can run on the mjb bootloader but you have to modify the updater script to include it. but what the post says above if you try to downgrade the bootloader from mj2 ATT then it will brick the device
I have the MVLDLK4 bootloader. The only thing I am worried about is that there might be a few errors while using the ROM. I have tried about 3-4 4.2.2 ROMS but there is always 1 or 2 errors eg. Wifi does not work. Since there is only a few roms on 4.4+, i am worried I wont get a stable rom with minor error.
Cause If I update and the rom has errors, I have no backup rom.
hi.
and thanks.
I have tried a few 4.4.2 ROMS and they all loaded on my 4.1.2 bootloader so I would assume they would load on your phone's newer bootloader.
If you're not sure, you can look at the ROM's updater script to make sure.
audit13 said:
I have tried a few 4.4.2 ROMS and they all loaded on my 4.1.2 bootloader so I would assume they would load on your phone's newer bootloader.
If you're not sure, you can look at the ROM's updater script to make sure.
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are you or were you with MJB bootloader when tried 442 roms?
thanks
hormosapiens said:
are you or were you with MJB bootloader when tried 442 roms?
thanks
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I don't recall which bootloader I had but I never had 4.3 on my phone; therefore, I never had Knox. I was able to load 4.4.2 ROMs with the stock 4.1.2 bootloader.
I know my bootloader is older than 4.3 because I was able to flash a stock 4.1.1 ROM onto my 4.1.2 ROM using desktop Odin. I unlocked my phone while on 4.1.1 and flashed back to stock 4.1.2. The stock ROMs from samfirmware include bootloaders and modems.
SO I just got a s3 MJB bootloader I've been doing research and it seems like with this bootloader you can brick your phone if you install ROMs that mess with the bootloader. I was just wondering how you can tell if a rom going to flash a new bootloader?
By reading the description? If you're flashing a TouchWiz based ROM that is on 4.1.2 Jelly Bean, you can flash that only if you're NOT on the MJB bootloader. If you're on the MJB bootloader, you can only flash 4.3 TouchWiz based ROMs.
AOSP does not matter, at least to my understanding. You will more than likely need to upgrade CWM or TWRP if you plan on flashing AOSP KitKat ROMs. If you don't, you'll get an error when flashing that can only be resolved on the latest versions or CWM or TWRP.
Sent from my SAMSUNG-SGH-I747 using Tapatalk
Hi guys I need some information regarding to How to root, flash Custom ROMS, flash various Recoveries and if I want to revert back to full stock ROM whenever I want to how will I do it?
My device model is SGH-I747M (Rogers Carrier) and I've updated it to the latest OTA update 4.4 KitKat
I've seen may threads regarding to the SGH-I747 but all are for AT&T carrier but not any single for the Rogers carrier why?
Do you have any warranty left on your phone? Flashing a custom recovery will trip the warranty counter and change it from 0 to 1.
audit13 said:
Do you have any warranty left on your phone? Flashing a custom recovery will trip the warranty counter and change it from 0 to 1.
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I haven't rooted/flashed nothing on my phone yet. All I'm just asking the question bro and yea I don't have any warranty for it
The easiest way to root, in my opinion, is to flash a custom recovery in Odin. After flashing a custom recovery, boot into recovery, flash supersu, boot the phone, allow supersu to update and disable knox. Then boot back into recovery, create a nandroid backup, and flash a custom ROM for the d2lte.
To flash back to stock, you can restore your nandroid backup or flash a stock ROM from sammobile.com. Just make sure to match the sammobile.com ROM with your bootloader.
The big difference between the i747 (AT&T) and the i747M (various Canadian carriers) is the bootloader and modem. They are NOT interchangeable between the i747 and the i747M. I haven't seen any of the custom ROMs for these SGS3s that flash bootloader and modem. Therefore any of the custom ROMS for the i747 will work with the i747M. Custom TouchWiz based ROMs are safe to use.
If the instructions for installing a ROM say that you must be on the NE4 or NJ1 bootloader and modem, the equivalent for the Rogers i747M are (NDx?), NF2, and NKx. From your original post I believe you are on the NKx bootloader and modem pair. This is good for any of the Kitkat and Lollipop ROMs. The only catch is that the updater-scripts for some of the older KK ROMs may not recognize the newest bootloader and modems. The ROMs are still good, it just takes a bit of work to get them installed. The same extra work would actually allow you to run a JellyBean (4.3) ROM.
Stock ROMs, those designed to return your device to factory condition (+/- root and +/- custom recovery), require much more care.
If you ever need to return to stock for your i747M, DO NOT flash a ROM that will down grade your modem and bootloader. Downgrading the bootloader and modem once you are at, or past, the 4.3.x versions will brick the i747 and I have read it will do the same for the i747M. If you can not find a stock ROM in the forums for the i747M you can find them at sammobile.com.
There are some stock ROMs available in the forums that include the AT&T bootloader and modem. DO NOT flash/install any of these.
There are stock ROMs for the i747 in the forum that do not contain bootloader and modem. These are safe for you, but BE CAREFUL. You do not want to mistakenly try to install one that does have the bootloader and modem
Also, do not flash a modem that does not match your bootloader in version number. This did not matter prior to the 4.3 bootloader and modem, it has ever since.
Ive been searching for awhile now but at work is my only time to do so and time is limited.. I am searching for a rom to run with ucdmg2 bootloader. I'm not really feeling up to updating the bootloader using odin.
hatchguy06 said:
Ive been searching for awhile now but at work is my only time to do so and time is limited.. I am searching for a rom to run with ucdmg2 bootloader. I'm not really feeling up to updating the bootloader using odin.
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Do you have a custom recovery installed?
You didn't say, but I can infer that you have an i747 and not an i747M based on the MG2 bootloader.
Without a custom recovery you are stuck using Odin to get a custom recovery in order to flash anything other than a stock rom. There are recovery flashable bootloader and modem files for 4.3 and newer bootloaders and modems.
With the 4.1.2 bootlaoder and modem you could run Jellybean roms from CM ( CM10.x ) or those based on CM or AOSP. There may be a few AOSP bassed on KitKat you could use, but it would probably be a version that is more than a year and a half old. Anything newer will need a 4.4.2 bootloader.
dawgdoc said:
Do you have a custom recovery installed?
You didn't say, but I can infer that you have an i747 and not an i747M based on the MG2 bootloader.
Without a custom recovery you are stuck using Odin to get a custom recovery in order to flash anything other than a stock rom. There are recovery flashable bootloader and modem files for 4.3 and newer bootloaders and modems.
With the 4.1.2 bootlaoder and modem you could run Jellybean roms from CM ( CM10.x ) or those based on CM or AOSP. There may be a few AOSP bassed on KitKat you could use, but it would probably be a version that is more than a year and a half old. Anything newer will need a 4.4.2 bootloader.
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Yes I'm running the newest cwm recovery at the moment. so I guess ill track down a cm10 rom ..
hatchguy06 said:
Yes I'm running the newest cwm recovery at the moment. so I guess ill track down a cm10 rom ..
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If you haven't found one yet, check here: https://download.cyanogenmod.org/?device=d2att&type=snapshot
Don't forget GApps.