I'm currently on AOSP, Is there any way how I can update my bootloader to the latest one? I know you have to Odin flash and check update bootloader, but which 4.4.2 official firmware do I flash? Would flashing an SM-N900 work?
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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?
Click to expand...
Click to collapse
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.
I have an AT&T SGH-i747 with bootloader I747UCDLK3, modem I747UCUEMJB and running CWM 6.0.3.8. I am planning on updating the bootloader to UCUFNE4. I have already unlocked the phone. Is there anything else I should do while my bootloader is still on UCDLK3 before I take the leap to UCUFNE4? Any suggestions and advice is appreciated. Thanks.
Did you carrier unlock your phone? If not, flash back to stock 4.1.1 using Odin, sim unlock using the free method, and run OTA updates until you get to the latest KK stock ROM. You can then install a custom recovery, flash supersu, disable know, and flash custom ROMs.
I have a Canadian Galaxy S3, on 4.1.1 DLK4 Official. I rooted it, and have TWRP.
I want to upgrade my rom to a CM12/13 but of course with root and custom recovery, OTA updates are blocked.
I need newer bootloaders and modem to run the newer android versions.
Should I install them now, while on 4.1.1, and then flash CM12, or should I sequentially update each of the AT&T firmwares until I get up to 4.4.2?
Do official roms have the bootloaders and modems in them and install them automatically?
Should I use the Kies restore method?
The Canadian and att s3 phones are not the same model number. Don't flash an att bootloader to your Canadian phone as this may brick the phone.
Flash latest stock rom from Sammobile.com, flash twrp, flash cm.
audit13 said:
The Canadian and att s3 phones are not the same model number. Don't flash an att bootloader to your Canadian phone as this may brick the phone.
Flash latest stock rom from Sammobile.com, flash twrp, flash cm.
Click to expand...
Click to collapse
Okay, but i can use AT&T roms tho?
The i747m will work with d2can, d2lte, and d2att Roms.
Is it safe to flash straight from 4.1.1 to 4.4.2 using a sammobile rom? will i brick due to Knox bootloader and modem?
Can I flash it using TWRP?
If someone could link a tutorial that would be very helpful.
I keep reading stuff that says to flash the newer bootloader before flashing a 4.3 firmware, and some that say the opposite. Others say that people should incrementally update.
I want to go from 4.1.1 original with Root and TWRP, to CM13.
Thank you.
Yes, you can flash the latest stock 4.4.2 rom from Sammobile.com directly to your phone. No need to do anything other than backing up your data.
audit13 said:
Yes, you can flash the latest stock 4.4.2 rom from Sammobile.com directly to your phone. No need to do anything other than backing up your data.
Click to expand...
Click to collapse
Thank you!
Now I just need to get the balls again to use odin. Flashing the custom recovery using the Universal Tool Kit that had step by step walkthrough was adrenaline rush enough LOL.
I could also use Kies, as that has 4.4.2 OB3 (telus), and also has "emergency firmware recovery" feature if a brick ever happens. Though ideally the only time boot.img gets flashed is only with Full Stock Firmware files.
I find kies to be unreliable when I have tried to restore firmware so I always stuck with Odin.
So, I'm still in lollipop blobs and would like to update to marshmallow. Can I just flash the latest mm stock rom to any stock recovery? Or do I need to flash the first mm stock rom release before flashing the latest stock?
Edit: Does upgrading to mm makes the bl locked?
Hello,
You could grab the latest full stock MM to the root of SD card and let FOTAService to detect it and choose the package. It'll automatically reboot to recovery to flash updates.
I successfully updated to stock MM .134 from .196 LL without relocking bootloader. Some may have their bootloader re-locked.
Regards.
Sent from my ASUS_Z00A using XDA Labs
Hi my names Adrian.
I have a question about my I747. Can i downgrade my phone to oryginal firmware if i have now Android 4.4 CM 11,2. This mod based on I747UCDLK3 bootloader? If nothing bad happens to my phone if go back to stock? thanks for the reply.
You cannot flash a stock ROM that has a bootloader that is older than the bootloader currently installed on the phone.
Even flash by odin with PIT file? This method works on I9300.
Nope, can't be done with a pit file. Are you sure you can install a 4.1 bootloader over a 4.3 bootloader? I don't have the 9300 so I can't test.
Ok i understend. In 9300 not downgrade bootloader. I using 3-files ROM with new bootloader. This method allowed me back to stock from CM14.