Backup bootloader only and flash samsung devices - Android Q&A, Help & Troubleshooting

I have a samsung P902 tablet which is specified version for P901 galaxy note pro 12.2". P902 version doesn't have stock rom or getting any update. Meanwhile P901 got android 5 recently. P901 and P902 has same hardware. So i need to update the bootloader to newest to use lollipop roms on my P902 device. Since there isn't a stock rom i need to keep myself safe. So is there a easy way to backup bootloader and make it flashable via odin or heimdall? Any information could help.

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Flashing another Region's firmware on Samsung J7 Pro (SM-J730GM)

Hello All,
Please I want to know the consequences of flashing the rom of another region on your Samsung device. Let me explain why I ask this
So recently I upgraded my Samsung j7 Pro (J730GM) to Android 8.1 Oreo and that update changed the binary version of my device to 5 (i.e. J730GMDXU5) so I tried downgrading the phone back to 7.0 but that did not work because Samsung has not released an Android 7.0 Nougat firmware with binary version 5 so downgrading the normal way was quite impossible.
Now I recently found out that Samsung has released an Android 7.0 Nougat firmware with binary version 5 but the region/country it was released for is Mexico while my phone's region is Thailand.
Now my question is, is it possible to downgrade my J7 Pro with the Mexico firmware although my device's region is Thailand because they are both binary version 5? If yes, what are the possible consequences?

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So i have had me galaxy M30 for a while now it came out with android 9.0(Pie) and just recently got the android 10 update to OneUI 2. I haven't rooted it or installed a custom boot loader yet. i wanted to do that and i was doing some research and I read about how TWRP isnt ready for phones that come with android 10 out of the box. i was wondering if the would have a problem on my M30 too or if its safe.
if it is safe to install TWRP in my M30 the has already been updated to android 10. Then where can i get the suitable version of twrp and the steps to install it. Also where can i get the stock boot loader incase I wanted to change it back.
device info:
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Is downgrade Pie => Nougat possible?

Hi, I would like to downgrade my Samsung XCover 4 (G390F) from Android 9 to 7. Is it possible? Simply flashing the stock Nougat using Odin fails because of different bootloader version.

Samsung s6 edge system.img problem

Hi,i am tried to flash my s6 edge g925a with 7.0 nougat. it's say system.img failed.I am tried other usb port,and diferent firmware.
niksiccable said:
Hi,i am tried to flash my s6 edge g925a with 7.0 nougat. it's say system.img failed.I am tried other usb port,and diferent firmware.
Click to expand...
Click to collapse
How have you tried to flash the firmware?
And is it a stock/Samsung firmware or a custom rom?
If it's a stock firmware, you should read the guide how to official Samsung firmware using Odin on PC:
How to update your Samsung Galaxy smartphone and install official firmware
Follow these instructions to manually install Android updates through recovery, and full firmware using Odin on Samsung Galaxy smartphones.
www.xda-developers.com
try to use different version of odin

Can TWRP Flash Firmware of Samsung Galaxy A7 2017?

I'm not able to use odin because it fails.
It was from Android 8 stock and now using Custom Rom Lineage which is not working well. My Android ver now is 11. I know I cannot downgrade using ODIN and it doesn't work.
Any suggestions?

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