Id like to downgrade my S7 from nougat to marshmallow. My current lowest factory reset option is nougat on bootloader version 3. Id like to downgrade to a downloaded stock firmware that uses version 1 of the bootloader.
my device is currently rooted and carrier unlocked
ive made a full backup of the nougat system, before ive done anything to it other than the rooting.
ive been reading around that some people were able to bypass the downgrade bootloader lock error in odin by first going into their desired downgraded firmware tar files and deleting any file that ends in .bin , and then successfully been able to flash the older firmware. what I want to know is if i decide to try this, and it still doesnt work in odin, or something still doesnt work properly - am i still able to fully restore from that backup ive just made? has anyone done this without issues? i hate the look and feel of nougat and oreo looks and feels the exact same...
i did make another thread about downgrading, but i didnt know nearly as much at the time. Been told downgrading is impossible and thats true, officially speaking. Id just like to know if anyone has been successful with this workaround.
What model, SM-G930F? Is OEM Unlocking turned on?
If it's a G930U/V/T/A/P then you won't be able to.
For the G930F so long as you don't have the latest Nougat version it shouldn't prevent downgrading. Otherwise upgrading up to Oreo then back down just by flashing in Odin should work, as Oreo doesn't have the downgrade lock that the newest Nougat has.
Beanvee7 said:
What model, SM-G930F? Is OEM Unlocking turned on?
If it's a G930U/V/T/A/P then you won't be able to.
For the G930F so long as you don't have the latest Nougat version it shouldn't prevent downgrading. Otherwise upgrading up to Oreo then back down just by flashing in Odin should work, as Oreo doesn't have the downgrade lock that the newest Nougat has.
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model is sm-g930w8 but yes OEM unlocking is on, and so is usb debugging just to be on the safe side. It is running the very first version of nougat right now, 7.0. But the security patch is from feb 2018. Ive read that the bootloader itself is unlocked on this version of the phone though, its just that downgrade protection in the software that could get in the way, if what i read was correct? in the same place was where i read that deleting those bin files from the firmware i want to install would be a good workaround, it would make the bootloader not check it at all if i read it correctly.
i havent tried anything yet, ive been doing my research first to stay on the safe side. it might work without issues, but I want to be prepared for if issues do arise, what the correct next step should be to keep the device itself not bricked
Yea not 100% sure for the G930W8, it's the same SoC as the G930F but the firmware restrictions could be different since it's the Canada specific version
so, i decided to brave it and try it, since to read around you find alot of conflicting information... i was suspecting that odin would fail shortly after starting at sboot.bin if it was the bootloader thats the issue. but it didnt. it failed the very next step after that at param.bin.
anyone happen to know what param.bin means?
What files are you trying to flash? I have had the same problem, even though the bootloader is unlocked the device has efuses that prevent downgrade to older binary. I was using U2 binary and only managed to downgrade to nougat u2 binary version. Even when I skipped bootloader files, marshmallow would still give an error that system.img is version 0 where as device is v1
I've been told that if I can downgrade to 8.0.0.374 that I could get the bootloader unlocked by ministry of solutions. Whenever I try to get that version from Firmware Finder, erecovery always downloads the .377 version.
Does this mean I can't downgrade?
I'm currently on firmware LMV500NAT-00-V20x-LAO-COM-OCT-27-2020+0, and am dying to get lineage os installed. But whenever I try to downgrade using LG UP, the software will auto close.
I'm guessing that it's some prevention measure by LG to stop users from downgrading, like Apple.
Does anyone have any guides on how to downgrade the firmware?
the thing i research about is that we have to unlock bootloader of phone first then we can flash or downgrade
Hello, I wanted to ask a few questions
After a firmware flash with XPG CSC code for example is it possible to change the CSC code to THL and vice versa?
Is there really any way to lower firmware to a lower version?
If so, what file / path do I need to do this?
what is the differences between OXA and OXM?
Is there a place where you can read about the new changes that Samsung has made in recent years in terms of security that can not flash firmware to an older version and can not change CSC codes?
I know how to root a phone and use ADB (ADB in a very basic way)
Thanks!
up
This post has some information
Fail to flash with odin to downgrade from android 10
About a year ago, I downloaded firmware for N960F from updato and downgraded from Pie to Oreo using Odin and it went all so well. This time around I'm trying to downgrade from Android 10 to the exact same firmware version I used back then, just...
forum.xda-developers.com
But since about the s8-s9 days Samsung implimented anti rollback , wich are not so clear , some phones cand downgrade to a previous version and some dont due the firmware setting the minimun version bar higher so to speak .
Wich model are you trying to downgrade?
I got a KOB2-L09 Region C636 and I've been wanting to downgrade the firmware version but I somehow can't find any downloads for my device. Anyone know a great firmware database or something like that? I am unable to use a computer for the moment so I don't think I'd be able to use HiSuite Proxy.
94FBR said:
I got a KOB2-L09 Region C636 and I've been wanting to downgrade the firmware version but I somehow can't find any downloads for my device. Anyone know a great firmware database or something like that? I am unable to use a computer for the moment so I don't think I'd be able to use HiSuite Proxy.
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You need a PC, otherwise, you can't flash anything even if you do find the firmware.