Develop Bugs

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.

[Q] I747M still on Rogers 4.1

Hi,
I just noticed that my wife's Galaxy S III still has original 4.1 stock ROM. I tried to do a OTA update (Rogers) but the system is saying that there is no update available. The phone is rooted.
Do I need to unroot the phone to get the update?
Thx,

Roli001 said:
Hi,
I just noticed that my wife's Galaxy S III still has original 4.1 stock ROM. I tried to do a OTA update (Rogers) but the system is saying that there is no update available. The phone is rooted.
Do I need to unroot the phone to get the update?
Thx,
Click to expand...
Click to collapse
Just download 4.3 Rogers and you now have the latest firmware with root. Good Luck
http://forum.xda-developers.com/showthread.php?t=1739426

If you load 4.3 with an updated bootloader, you won't be able to downgrade the OS.

audit13 said:
If you load 4.3 with an updated bootloader, you won't be able to downgrade the OS.
Click to expand...
Click to collapse
Yeah that is true but if you don't want 4.3 then you can always download the 4.1.2 or 4.1 instead.

Thanks ALL
Thanks All!

Update in pc

I am on 4.1.2 Jelly bean rooted and unlocked with mako bootloader, my pc tells me that there is a new update for my phone. If I install it, is there any chance that I can brick my phone? Can somebody tell me what will happen if I update it? Please, thank you!

darkmixta said:
I am on 4.1.2 Jelly bean rooted and unlocked with mako bootloader, my pc tells me that there is a new update for my phone. If I install it, is there any chance that I can brick my phone? Can somebody tell me what will happen if I update it? Please, thank you!
Click to expand...
Click to collapse
Yes, you gonna brick it. Don't do OTA if you're bootloader unlocked. You should flash the firmware update manually. I got my n7 bricked long time ago after updating ota.

[Q] Downgrade 4.4.2 to 4.1.1 to unlock

Is it possible to downgrade from 4.4.2 to 4.1.1 to unlock the device?

You just flash the 4.1.1 then probably have to flash your bootloader if it doesn't boot and then flash the jl2 radio

Hi, I have a custom rom, the galaxy project 4.4.2. What I need to do to unlock the phone?
Can I downgrade to a custom 4.1.2 via recovery, and apply the unlock tutorial?

Correct me if I'm wrong, It's the bootloader that has to be downgraded in order to unlock using the hidden menu. But with devices that took OTA updates 4.3 or later, downgrading bootloader will brick the phone. I'm also looking for an unlock option but no luck so far because my Note 2 has OTA 4.4.2. Does anyone have better information about this?

Can i Downgrade my AT&T running stock 4.4.2 rom to 4.1.1 ?

Can i downgrade urooted I747 from 4.4.2 to 4.1.1 using odin without bricking my phone?
My build number is KOT49H.I747UCUFNJ1
And also can i update that to 4.4.2 OTA again?
Please reply soon.

You can downgrade the ROM but not the bootloader. Attempts to downgrade the bootloader will probably brick the phone.

audit13 said:
You can downgrade the ROM but not the bootloader. Attempts to downgrade the bootloader will probably brick the phone.
Click to expand...
Click to collapse
Im sort for noob question. But whats a bootloader and how can I downgrade to 4.1.1 without flashing bootloader?

Are you trying to downgrade to 4.1.1 to sim unlock the phone using the free method? If you are, this will not work because the 4.1.1 modem will not work on a 4.4.2 bootloader. You will need to obtain an unlock code.

audit13 said:
Are you trying to downgrade to 4.1.1 to sim unlock the phone using the free method? If you are, this will not work because the 4.1.1 modem will not work on a 4.4.2 bootloader. You will need to obtain an unlock code.
Click to expand...
Click to collapse
MY phone is already sim unlocked I am just trying to fresh install stock Rom on my phone which is on 4.4.2. Can you help me with links please. AND THANKS for the quick reply

You will not be able to downgrade the rom to 4.1.1 while keeping the bootloader at 4.4.2 because the modem will not work on a 4.4.2 bootloader which means you probably can't run ota updates.
To downgrade without touching the bootloader and modem, you need to use mobile Odin. Also, you will have to find a source for the 4.1.1 stock rom since att pulled it from sammobile.com.

audit13 said:
You will not be able to downgrade the rom to 4.1.1 while keeping the bootloader at 4.4.2 because the modem will not work on a 4.4.2 bootloader which means you probably can't run ota updates.
To downgrade without touching the bootloader and modem, you need to use mobile Odin. Also, you will have to find a source for the 4.1.1 stock rom since att pulled it from sammobile.com.
Click to expand...
Click to collapse
Willl this work If i flash with mobile odin?
sammobile,com/firmwares/database/SGH-I747/

You may be able to flash 4.1.1 with mobile Odin but ota updates probably won't work due to a mismatch between the bootloader and rom. Also, the ota updates normally get applied in order: first, 4.3, then 4.4.2.

So in Theory If we flashed back and was a success...
Then we can do the unlock and flash back to 4.2.2 then rom it again ?

stunna946 said:
So in Theory If we flashed back and was a success...
Then we can do the unlock and flash back to 4.2.2 then rom it again ?
Click to expand...
Click to collapse
i am still not certain. But thanks for your time and effort )

stunna946 said:
So in Theory If we flashed back and was a success...
Then we can do the unlock and flash back to 4.2.2 then rom it again ?
Click to expand...
Click to collapse
Nope, can't unlock using the free method if the phone is running a 4.3 or newer bootloader. Even if you downgrade the rom to 4.1.1.

audit13 said:
Nope, can't unlock using the free method if the phone is running a 4.3 or newer bootloader. Even if you downgrade the rom to 4.1.1.
Click to expand...
Click to collapse
Thanks, Ive tried going thru ATT to unlock phones in the past its like pulling teeth. I have a 0 success rate. :crying: I Just have this Brand new T mobile sim I want to use.
Furthermore, I've even tried the I'm going over seas trick.. They say they will send it to my email, an nothing; Ive even called back to confirm the correct email too..

stunna946 said:
Thanks, Ive tried going thru ATT to unlock phones in the past its like pulling teeth. I have a 0 success rate. :crying: I Just have this Brand new T mobile sim I want to use.
Furthermore, I've even tried the I'm going over seas trick.. They say they will send it to my email, an nothing; Ive even called back to confirm the correct email too..
Click to expand...
Click to collapse
Any chance their emails are ending up in a spam/advertising folder and not making it to your inbox?
I've had no problems with AT&T unlocking phones in past. As long as you're "eligible" (I assume that means off contract) they email the codes and instructions, no fuss.