Hallo all!
I have a Samsung S8 that the hardware is SM-G950W (Canadian) and I flashed it to SM-950U (USA) and I eventually want to downgrade it to Android 7 from Android 9 with U8 bootloader.
Problem is I have found a combination file that has the U8 bootloader and Android 7 and the factory Android 7 ROM (Original) but the factory ROM only gets to U5 bootloader if I remember correctly, or perhaps U2 it was.
My idea is to take the bootloader files out of the Android 7 U8 combination files and make them work in place of the Android 7 factory ROM bootloader files. So I wondered what files in a ROM or combination file would I need to swap out? Will this work on a Galaxy S8 with a never unlocked bootloader?
Is this a good idea to try? I also thought to take Android 9 bootloader files and decompress their .lz4 extensions and swap them but I kind of dont think that thats a smart idea as differing Android versions are more likely to differ in unforseen ways. Android 7 doesnt use .lz4 compressed files where Android 9 does.
Any help? This is the only way I can foresee myself using my hardware my way. Thanks.
Related
I would like to downgrade my galaxy s8 (G950U) sprint version from Oreo 8.0 back to Nougat 7.0 but I’ve been having a hard time figuring out if it’s possible.
Looking around I’ve seen people saying that’s it’s not possible due to the bootloader which doesn’t allow you to go down from v2 back to v1.
It’s also my understanding that the fifth number from the right is the bootloader version, in this case I have version two (G950USQU2CRC5). Now, looking at the Nougat releases for the phone, the last three that were released before Oreo show that they have the version two bootloader (G950USQS2BRB1, G950USQS2BQL1, G950USQU2BQK5).
So, would it be possible to downgrade if I used one of these three versions or are there other things preventing this that don’t involve the bootloader?
Thanks.
Yes. As long as the bootloader version of the package and the bootloader version on your phone are the same, you're fine.
Also, don't flash a bootloader 3 package unless you want to completely ditch Nougat or don't want root for a long time.
Potatey said:
I would like to downgrade my galaxy s8 (G950U) sprint version from Oreo 8.0 back to Nougat 7.0 but I’ve been having a hard time figuring out if it’s possible.
Looking around I’ve seen people saying that’s it’s not possible due to the bootloader which doesn’t allow you to go down from v2 back to v1.
It’s also my understanding that the fifth number from the right is the bootloader version, in this case I have version two (G950USQU2CRC5). Now, looking at the Nougat releases for the phone, the last three that were released before Oreo show that they have the version two bootloader (G950USQS2BRB1, G950USQS2BQL1, G950USQU2BQK5).
So, would it be possible to downgrade if I used one of these three versions or are there other things preventing this that don’t involve the bootloader?
Thanks.
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Click to collapse
did you ever get the chance to downgrade? could you please let me know how you did it? please include links to the files that work for you. thanks!
Hi. I've never really liked the Android version in my Lenovo but I am now facing an annoying issue with Play Store downloads getting stuck and delayed and going to have to reinstall.
At this point I am ready for a root and changing the ROM but I am rather lost in what android distribution are working and tested at the moment as after reading for a while there are some which are only for the Win version. I also see some references to X90L on threads about rooting and installing twrp but I am assumming these would work the same on my F version.
So the question is, what updated current ROMs are working fine and are worth (better than the official one) after root and TWRP on the Android version?
Also, once unlocked and changed bootloader, where can you get the official ones again?
Thanks for any help.
"Also, once unlocked and changed bootloader, where can you get the official ones again?"
You don't need it if you flash YB via Intel Flash Tool with oryginal rom.
My device is Samsung Galaxy j5 2017 Pro Dual Sim.
Right now I am on pie,one ui. I would like to go back to oreo since performance was,at least for me,so much better and i had more control of camera beacuse the app was better. Problem is now that my bootloader is V6 but all of the oreo firmwares are on V5. Is there ANY way to go back or am I stuck.
Maybe combining files,flashing oreo without bootloader md5 selected in odin?
You will have to extract the Oreo stock firmware and flash bootloader and modem using Odin.
Not as straightforward as it sounds either.
If I get time after work (yes I'm one of the unlucky ones still working in this mayhem) I'll have a look at it and try extract the files for you
Hi, my phone is a samsung galaxy J5 J530F 2017 dual sim. I updated my phone to ANDROID 9 (PIE) and I'm unhappy with the update. When I want to update back to Android 7 via odin, it ends with a FAIL error right at the beginning of the update. I managed to return to Android 7 with a backup I created via TWRP on Android 7, but the phone no longer runs smoothly and sometimes freezes. Is there any way I can get back to Android 7? I would be very grateful. Thank you.
garylawwd said:
You will have to extract the Oreo stock firmware and flash bootloader and modem using Odin.
Not as straightforward as it sounds either.
If I get time after work (yes I'm one of the unlucky ones still working in this mayhem) I'll have a look at it and try extract the files for you
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Click to collapse
Hey, I'm interested on this topic too, were you able to extract the files to do the downgrade?
I have a faulty android 10 security level S7 (very recent) flashed on my device. Can I flash older versions of combination files on my device?
Galaxy S10+
This thread might help you:
https://forum.xda-developers.com/s10-plus/how-to/flashing-combination-file-to-s10-10-t4053059
I have my reasons for wanting a device that runs Android 7, but can that subsequently be upgraded to Android 8 (and above), and I am thinking that a second hand Galaxy S8 might do the job.
However, since I am looking at second hand phones, there is no guarantee that it would actually be on Android 7 (unless the online shop is willing to check for me), and I am just wondering if, in the instance where the phone comes with Android 8 or above, would I be able to flash it back to Android 7, or would it be dependent on bootloader version. And if it is bootloader version dependant, which version would allow me to downgrade back to Android 7?
Thanks.
xAxB said:
I have my reasons for wanting a device that runs Android 7, but can that subsequently be upgraded to Android 8 (and above), and I am thinking that a second hand Galaxy S8 might do the job.
However, since I am looking at second hand phones, there is no guarantee that it would actually be on Android 7 (unless the online shop is willing to check for me), and I am just wondering if, in the instance where the phone comes with Android 8 or above, would I be able to flash it back to Android 7, or would it be dependent on bootloader version. And if it is bootloader version dependant, which version would allow me to downgrade back to Android 7?
Thanks.
Click to expand...
Click to collapse
On the S8 android version 7 has a binary ( bootloader ) version 1. Early version of Oreo has a binary ( bootloader ) 1 as well ie: beta and next few upgrades. I can't remember exactly when the version 2 binary ( bootloader ) was introduced, might have been 3 or 4 version of Oreo before being stable.
If looking for a 2nd phone that can by downgraded to android 7 you will need bl version 1. Anything with bl version 2 and higher can not be downgraded to android version 7.
You can check in settings - about phone - software information - Baseband version. Binary ( bootloader ) number will be the 5th number/letter from the right, you can also check build number as well.
spawnlives said:
On the S8 android version 7 has a binary ( bootloader ) version 1. Early version of Oreo has a binary ( bootloader ) 1 as well ie: beta and next few upgrades. I can't remember exactly when the version 2 binary ( bootloader ) was introduced, might have been 3 or 4 version of Oreo before being stable.
If looking for a 2nd phone that can by downgraded to android 7 you will need bl version 1. Anything with bl version 2 and higher can not be downgraded to android version 7.
You can check in settings - about phone - software information - Baseband version. Binary ( bootloader ) number will be the 5th number/letter from the right, you can also check build number as well.
Click to expand...
Click to collapse
Thanks a lot. Do you know if custom ROMs, for instance Lineage also update the baseband as you go up versions?
The second hand shop I was looking at update everything they sell with the latest available update and I suspect that is common practice. So I am thinking that the best option for me would be to sacrifice the e-fuse on my Samsung S7 with Android 7.0, and start playing with various Android versions / ROMs. However, I may want to go back to Android 7.0 on that phone eventually, so it is important that I don't accidentally mess that up.
xAxB said:
Thanks a lot. Do you know if custom ROMs, for instance Lineage also update the baseband as you go up versions?
The second hand shop I was looking at update everything they sell with the latest available update and I suspect that is common practice. So I am thinking that the best option for me would be to sacrifice the e-fuse on my Samsung S7 with Android 7.0, and start playing with various Android versions / ROMs. However, I may want to go back to Android 7.0 on that phone eventually, so it is important that I don't accidentally mess that up.
Click to expand...
Click to collapse
I normally use stock rom's as some of my apps don't work well with custom roms. Usually the only time that i've installed a custom roms is if someone else is having trouble with the installation process then i revert back to stock.
The Baseband ( in about phone ) will always show the current version of the OS whether it's stock or custom that you are on ( including updates ).
As far as i know custom roms do not increase you bootloader version number. So you should be able to revert back to the current stock rom that your on. You can always check bootloader version in Download ( odin ) Mode.
If you have any questions you should ask in the custom roms section for more information.