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For a 4.3 ROM, you need to install 4.3 bootloaders. Are there any drawbacks?

I'm considering upgrading to a 4.3 rom from 4.1.2 and I've learned that a stock image of 4.3 must be flashed first (thorugh Odin?) to update the bootloader to 4.3.
Is there any drawback to upgrading? Will I still be able to flash 4.1.2 roms using the 4.3 bootloader? Will I be able to downgrade to the 4.1.2 bootloader (should the need arise)?
Side question: is Odin the only way to update the bootloader? Can it be flashed through TWRP?

drdoombot said:
I'm considering upgrading to a 4.3 rom from 4.1.2 and I've learned that a stock image of 4.3 must be flashed first (thorugh Odin?) to update the bootloader to 4.3.
Is there any drawback to upgrading? Will I still be able to flash 4.1.2 roms using the 4.3 bootloader? Will I be able to downgrade to the 4.1.2 bootloader (should the need arise)?
Side question: is Odin the only way to update the bootloader? Can it be flashed through TWRP?
Click to expand...
Click to collapse
You'll have Knox. (Stock) which locks u down cause u can't downgrade and by rooting, you're going for a un-reset-able Knox Warranty Void trigger. Downgrading bootloader is impossible as of now, but flashing ROMs should be possible. (Should, not damn sure)
Side Answer: don't think so. Just flash stock 4.3 through TWRP and u should be good to go.
Smack that thanks button If I helped!
Note 2 LTE powered by Illusion ROM and Plasma Kernel.
Sent from dat small country called Singapore.
P.S. Quote my post for replies ASAP.

drdoombot said:
I'm considering upgrading to a 4.3 rom from 4.1.2 and I've learned that a stock image of 4.3 must be flashed first (thorugh Odin?) to update the bootloader to 4.3.
Is there any drawback to upgrading? Will I still be able to flash 4.1.2 roms using the 4.3 bootloader? Will I be able to downgrade to the 4.1.2 bootloader (should the need arise)?
Side question: is Odin the only way to update the bootloader? Can it be flashed through TWRP?
Click to expand...
Click to collapse
I'm running 4.3 JediMasterX2 with old bootloader and devil kernel and everything seems to be running fine. There was a very informative post made recently they gave a clean and simple explication of pros and cons to bootloader update. I'll try to locate and post a link but long story short, it's in your best interest not to update bootloader if you don't have to.
Edit:
http://forum.xda-developers.com/showthread.php?p=48817694

Bruce lee roy said:
I'm running 4.3 JediMasterX2 with old bootloader and devil kernel and everything seems to be running fine. There was a very informative post made recently they gave a clean and simple explication of pros and cons to bootloader update. I'll try to locate and post a link but long story short, it's in your best interest not to update bootloader if you don't have to.
Edit:
http://forum.xda-developers.com/showthread.php?p=7694
Click to expand...
Click to collapse
Invalid link.

This may help.
http://forum.xda-developers.com/showthread.php?p=48817694
Sent from my SGH-T889 using xda app-developers app

drdoombot said:
I'm considering upgrading to a 4.3 rom from 4.1.2 and I've learned that a stock image of 4.3 must be flashed first (thorugh Odin?) to update the bootloader to 4.3.
Is there any drawback to upgrading? Will I still be able to flash 4.1.2 roms using the 4.3 bootloader? Will I be able to downgrade to the 4.1.2 bootloader (should the need arise)?
Side question: is Odin the only way to update the bootloader? Can it be flashed through TWRP?
Click to expand...
Click to collapse
Please don't do the official update and get yourself locked down like many of us have. I have flashed many 4.3 roms and they worked fine. Got a new phone and did the official update and now I cannot send this device in for warranty because of the KNOX flash counter.

drdoombot said:
Invalid link.
Click to expand...
Click to collapse
Sorry idk what happen but it's fixed. Cipher also posted link a few post up.

Can you downgrade bootloader?

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.

[q] 4.3 jellybean ota questions

I've got a Galaxy S3 I747 it is currently running 4.1.1, I747UCDLK3 Baseband. I'm not exactly a noob when it comes to flashing and rooting, I know my way around CWM and Odin pretty well. But I have a few questions on this 4.3 OTA. (I am a forum noob)
-Will I still be able to root? (I heard CF works for it)
-Can I install CWM? (Is the Bootloader locked??)
-Will I be be able to I flash other roms than the 4.3 TW like CM11Snapshot? (Is the bootloader locked?)
-What the h*ll is knox and why should I be worried?
-What is with the boot loader downgrading thing? (Have to do with locked bootloader??)
I AM NOT AT ALL WORRIED ABOUT A FLASH COUNTER OR VOIDING A WARRANTY I AM NOT ON A CONTRACT . I JUST DO NO WANT TO HARD BRICK MY PHONE.

If you take the OTA 4.3 update, it will install Knox and the 4.3 bootloader.
The 4.3 bootloader cannot be downgraded and attempts to do so will probably brick the phone.
You can root the stock 4.3 ROM with auto root but Knox may interfere with the process of cause issues after the fact.
You can still install CWM. I rrefer Philz Touch which is CWM-based.over TWRP.

So can I still flash roms?
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Yes, you can flash ROMs. Is your phone unlocked? Since you're on 4.1.1 stock, you can unlock it for free.
Personally, I avoided the 4.3 update because it installs knox and the 4.3 bootloader which can cause problems when using Odin to get back to stock.
I have a Canadian version of the s3 and I'm able to run KK ROMs with a stock 4.1.2 bootloader.

audit13 said:
Yes, you can flash ROMs. Is your phone unlocked? Since you're on 4.1.1 stock, you can unlock it for free.
Personally, I avoided the 4.3 update because it installs knox and the 4.3 bootloader which can cause problems when using Odin to get back to stock.
I have a Canadian version of the s3 and I'm able to run KK ROMs with a stock 4.1.2 bootloader.
Click to expand...
Click to collapse
Unlocked as in Bootloader? Yeah I've been able to flash roms via CWM and Odin on 4.1.1 and as in Carrier unlocked? Yes I use Straight Talk on this ATT S3
If I got the 4.3OTA I wouldn't need Odin to go back stock if I flashed a ROM would I? I could just make a back up via CWM then restore later if I wanted right rather than using ODIN?
See I can't use KK roms because I have the 4.1.1 BL so is there a way I can upgrade my boot loader to the 4.1.2 version??
Would I lose my carrier unlock if I upgraded to 4.3 or if I upgrade my bootloader??

I suggest downloading a ROM you want to try, then unzip the ROM and look at the updater script to see which bootloaders are supported. The updater-script file is located in \META-INF\com\google\android\updater-script. You can use a text editor to open the updater-script file.
The first few lines will list the bootloaders that are supported. I run Validus which is a KK ROM using a stock 4.1.2 i747m bootloader.

Do you know about this > "If I got the 4.3OTA I wouldn't need Odin to go back stock if I flashed a ROM would I? I could just make a back up via CWM then restore later if I wanted right rather than using ODIN?"
Also couldn't I just upgrade my Bootloader and Modem from here?
http://forum.xda-developers.com/showthread.php?t=2321310
http://forum.xda-developers.com/showthread.php?t=1831898
I feel like if I upgrade my boot loader then I won't have to worry about restrictions.
Would I lose my carrier unlock if I upgraded to 4.3 or if I upgrade just my bootloader??

I ended up flashing the MG2 Modem and Bootloader, I'm good now, also if I want 4.3 I saw loserskater has a leak version that will be good and wont not let me downgrade my bootloader.

[Q] Going from 4.3 to 4.4,Stock and Bootloader

Hi all i need some quick clarification,
1) I am full aware that if you purchased a Note 3 on 4.3 and you updated to stock via either OTA, Kies or Odin the bootloader is upgraded and you cannot downgrade to 4.3 stock.
2) So my question is if you are stock 4.4 and install root, install custom recovery, Can you still downgrade to a 4.3 rom via custom recovery? or will it not allow me to downgrade at all?
3) Finally You can't downgrade to a 4.3 bootloader correct?

1) correct
2) 4.3 kernels do not boot with the 4.4 bootloader, so no
3) correct
Sent from my leanKernel 2.2 powered stock 4.4.2 SM-N900T

If u have the w8 Canadian variant u can downgrade your bootloader.

thanks

toastido said:
1) correct
2) 4.3 kernels do not boot with the 4.4 bootloader, so no
3) correct
Sent from my leanKernel 2.2 powered stock 4.4.2 SM-N900T
Click to expand...
Click to collapse
is 4.4.2 that bad for the n900t?
it seems people are trying to avoid upgrading the bootloader. and are trying to downgrade if already on kitkat. whats wrong with the kitkat bootloader?

Downgrading from 4.4.2 with NF2 Bootloader to 4.3 is it possible ?

i have stock 4.4.2 NF2 bootloader , what i need to do for change it to 4.3 ?
and is there any way to unlock hidden languages in 4.4.2 ?

Any attempt to downgrade the bootloader will cause a brick. You can, however, flash a 4.3 rom via custom recovery it will run on your current bootloader. Wifi may not work without using ktoonsez kernel though.
Sent from my SAMSUNG-SGH-I747 running TMS3KK-2.0