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Hello, I cannot downgrade to Nougat, I keep getting "Sw Rev Check Fail Device 2 Binary 1" on the phone side and ODIN simply says failed. When I try to downgrade from Oreo to Nougat. I have not been able to enable "OEM Unlock".
BTW, Sorry for incomplete title as the title bar disappears and I can only type a little bit.

Kenchinito said:
Hello, I cannot downgrade to Nougat, I keep getting "Sw Rev Check Fail Device 2 Binary 1" on the phone side and ODIN simply says failed. When I try to downgrade from Oreo to Nougat. I have not been able to enable "OEM Unlock".
BTW, Sorry for incomplete title as the title bar disappears and I can only type a little bit.
Click to expand...
Click to collapse
What model do you have? And what firmware version were you on before trying to downgrade? Some firmwares include bootloader updates which cannot be rolled back.

I have a N950F and this is the Oreo image I succesfully flashed "BL_N950FXXU3CRC1_CL13094739_QB17155977_REV00_user_low_ship.tar"
I can flash "COMBINATION_FA71_N950FXXU3ARA5" without a problem which is 7.1.1 But I think it's the bootloader that is giving me issues and since the combination file doesn't include a bootloader (AFAIK) it goes through, but when I try to put in any bootloader from Nougat, the flash fails.
I tried flashing:
-BL_N950FXXU1AQI1_CL12007350_QB14830234_REV00_user_low_ship.tar
-BL_N950FXXU1AQHB_CL12007350_QB14652984_REV00_user_low_ship.tar
and both failed. It's important to note that I'm trying to flash the whole thing, not just the "BL" file. I just pasted the BL file name because I think it holds the information you need.

Ok thanks for providing the info. One more question, what Odin version are you using?

It is not possible to downgrade.

sefrcoko said:
Ok thanks for providing the info. One more question, what Odin version are you using?
Click to expand...
Click to collapse
3.13.1

I have a similar problem. Bought my N950F in Panama but I'd like to change to Brazil's ZTO(unbranded) to be able to use Samsung Pay there.
I got Odin 3.13.1 and the ROM N950FXXU3CRDF_N950FOXM3CRE4_ZTO (latest 8.0.0) from SamMobile. When I try to flash I get the "Check Fail BOOTLOADER" message. Trying to uncheck the BL, I get another error but also not able to flash. Maybe my phone has a newer version that doesn't allow it to in theory "downgrade"?
Any solution?

carlosedp said:
I have a similar problem. Bought my N950F in Panama but I'd like to change to Brazil's ZTO(unbranded) to be able to use Samsung Pay there.
I got Odin 3.13.1 and the ROM N950FXXU3CRDF_N950FOXM3CRE4_ZTO (latest 8.0.0) from SamMobile. When I try to flash I get the "Check Fail BOOTLOADER" message. Trying to uncheck the BL, I get another error but also not able to flash. Maybe my phone has a newer version that doesn't allow it to in theory "downgrade"?
Any solution?
Click to expand...
Click to collapse
Yes some bootloaders can't be downgraded to earlier ones. What firmware version are you coming from?

sefrcoko said:
Yes some bootloaders can't be downgraded to earlier ones. What firmware version are you coming from?
Click to expand...
Click to collapse
@sefrcoko, I'm currently on Android 8.0.0, Baseband N950FXXU4CRG8, Build number R16NW.N950FXXU4CRGA.
I don't know if this is older or newer than the one I'm trying to flash. Is there a way to do it?
Thanks!

carlosedp said:
@sefrcoko, I'm currently on Android 8.0.0, Baseband N950FXXU4CRG8, Build number R16NW.N950FXXU4CRGA.
I don't know if this is older or newer than the one I'm trying to flash. Is there a way to do it?
Thanks!
Click to expand...
Click to collapse
Hi, yes you are on the "U4" bootloader and trying to downgrade to the "U3" bootloader (look at those characters in the build numbers, that's the bootloader version). Can't downgrade from u4 to u3 though.

sefrcoko said:
Hi, yes you are on the "U4" bootloader and trying to downgrade to the "U3" bootloader (look at those characters in the build numbers, that's the bootloader version). Can't downgrade from u4 to u3 though.
Click to expand...
Click to collapse
@sefrcoko this build number can bootloader unlock? i have same build number, i plan to unlock bootloader

paroys said:
@sefrcoko this build number can bootloader unlock? i have same build number, i plan to unlock bootloader
Click to expand...
Click to collapse
The Exynos models are all bootloader unlocked as far as I know.

sefrcoko said:
The Exynos models are all bootloader unlocked as far as I know.
Click to expand...
Click to collapse
Thanks , I'm already rooted haha:cyclops:

Can I flash everything except the bootloader? Will it work?
Do I have any option?
Thanks!

Downgrade from Pie back to Oreo because of the camera app

Hi,
I've wanted to try a One UI Pie rom, which I did, I like the new user interface, hate the new camera. I put my feedback on One UI as a PS at the end.
I believe one of the ROMs i tried required me to update bootloader to Pie. Is there a way to downgrade to Oreo, so i can install Oreo ROMS? I tried 2 ROMs and i get a boot loop on both.
Thanks,
Daniel
PS: One UI feedback: Used to be able to take either video or picture one click away, now it's 2. You used to be able to bind the Bixby button to Camera+Take picture with BxButtons, and volume keys to video. No longer possible with Pie. You don't know how important that is untill you went to the mountains, and you need some phisical buttons to use with your gloves. And most important, adding the Dual Shot mod is no longer possible, which was taking the same picture or video with both front and back cameras, which is again verry important for me.

dumitrudan608 said:
Hi,
I've wanted to try a One UI Pie rom, which I did, I like the new user interface, hate the new camera. I put my feedback on One UI as a PS at the end.
I believe one of the ROMs i tried required me to update bootloader to Pie. Is there a way to downgrade to Oreo, so i can install Oreo ROMS? I tried 2 ROMs and i get a boot loop on both.
Thanks,
Daniel
PS: One UI feedback: Used to be able to take either video or picture one click away, now it's 2. You used to be able to bind the Bixby button to Camera+Take picture with BxButtons, and volume keys to video. No longer possible with Pie. You don't know how important that is untill you went to the mountains, and you need some phisical buttons to use with your gloves. And most important, adding the Dual Shot mod is no longer possible, which was taking the same picture or video with both front and back cameras, which is again verry important for me.
Click to expand...
Click to collapse
We need to know what your current "Build Number" is on the phone. You also can't downgrade to other bootloaders that are lower then your current one, so if you're on bootloader 5 you need to use the Oreo bootloader 5 version firmware or it will not work.

MrMike2182 said:
We need to know what your current "Build Number" is on the phone. You also can't downgrade to other bootloaders that are lower then your current one, so if you're on bootloader 5 you need to use the Oreo bootloader 5 version firmware or it will not work.
Click to expand...
Click to collapse
Build number
PPR1.180610.011.hadesRom_OneUI_v4.0. Is this what you need?
Are you saying I'm never going to be able to install an Oreo Rom on my device?

dumitrudan608 said:
Build number
PPR1.180610.011.hadesRom_OneUI_v4.0. Is this what you need?
Are you saying I'm never going to be able to install an Oreo Rom on my device?
Click to expand...
Click to collapse
That's not a normal Samsung firmware.. Where are you from? Was that phone rooted or something? Considering that you have a different rom on the phone it looks like it's bootloader unlocked.. I'm assuming you're not from the USA and that your phone is a N950F correct?

dumitrudan608 said:
Build number
PPR1.180610.011.hadesRom_OneUI_v4.0. Is this what you need?
Are you saying I'm never going to be able to install an Oreo Rom on my device?
Click to expand...
Click to collapse
He is asking for the "N950FXXS5CSA2" firmware to see what bootloader you are on. (Bootloader # is the 5th spot from the right. This case the "5" from "5CSA2" IS THE BL. Version)
Usually it's in about phone/software/ baseband if not there it should say in download mode (look for B: # (# could be 1 to 5)) few lines down I think.
If your on bl. Version 5 you can be able to flash any N950FXXS5..... firmware but not lower like N950FXXU4......

MrMike2182 said:
That's not a normal Samsung firmware.. Where are you from? Was that phone rooted or something? Considering that you have a different rom on the phone it looks like it's bootloader unlocked.. I'm assuming you're not from the USA and that your phone is a N950F correct?
Click to expand...
Click to collapse
Hi, yes the bootloader is unlocked, I have a custom ROM, and my device is Rooted.
Baseband version N950FXXU5DSB1. So N950F, bootloader 5 I guess from what @BluePhnx said. Is there a direct connection between Bootloader 5 and android PIE? Or can Oreo ROMs be compatible with this bootloader?
Thank you for helping me clarify!

dumitrudan608 said:
Hi, yes the bootloader is unlocked, I have a custom ROM, and my device is Rooted.
Baseband version N950FXXU5DSB1. So N950F, bootloader 5 I guess from what @BluePhnx said. Is there a direct connection between Bootloader 5 and android PIE? Or can Oreo ROMs be compatible with this bootloader?
Thank you for helping me clarify!
Click to expand...
Click to collapse
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....

dumitrudan608 said:
Hi, yes the bootloader is unlocked, I have a custom ROM, and my device is Rooted.
Baseband version N950FXXU5DSB1. So N950F, bootloader 5 I guess from what @BluePhnx said. Is there a direct connection between Bootloader 5 and android PIE? Or can Oreo ROMs be compatible with this bootloader?
Thank you for helping me clarify!
Click to expand...
Click to collapse
See what @BluePhnx said? That's what I was trying to explain but he explained it better.. If you want to know what bootloader version you're on you do this see N950FXXU5DSB1 what you do is start at the very END and count backwards 5 letters/numbers and you end up on the number 5 like N950FXXU((5))DSB1 that equals bootloader version 5 but if you see something like this N950FXXU((6))DSB1 then it's bootloader 6 and if you were to flash that one you can never go back to bootloader 5 again it only goes forward but @BluePhnx explained it much better!

BluePhnx said:
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....
Click to expand...
Click to collapse
Hi
I am using Note8 and would like to go back to Oreo as there are too many bugs and I can't record calls. Can you please instruct me so I can do that? Details below.
Note8 SM-N950F
One UI version: 1.0
Android Version: 9
Baseband Version: N950FXXU5DSB1

thisman! said:
Hi
I am using Note8 and would like to go back to Oreo as there are too many bugs and I can't record calls. Can you please instruct me so I can do that? Details below.
Note8 SM-N950F
One UI version: 1.0
Android Version: 9
Baseband Version: N950FXXU5DSB1
Click to expand...
Click to collapse
What is your CSC?
Warning I haven't done this yet since I'm staying on pie. So do it on your own risk! I'm just saying what other people done.. Also I would've done it myself too.
Download the last oreo firmware for your CSC. (The one before Pie.)
Download Odin 3.13.1 or the latest version on computer.
Flash Oreo and home-CSC
But if it doesn't work or you get lots of force closures messages then do this steps.
WARNING!!!! this will erase all data off phone so backup FIRST!
Factory reset phone
Flash OREO with CSC file (NOT the home-CSC)
(What I've read people are saying to do the factory reset option for it to work. I haven't tried it myself since I'm staying in pie. That's why I included the first option.)

BluePhnx said:
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....
Click to expand...
Click to collapse
The problem is most custom ROMs don't actually tell you the firmware code or bootloader version. And I only saw 1 ROM that actually told me that it will update the bootloader to PIE (without specifying the actual version). Do you have any pointers on what should I look for when installing a custom ROM to prevent upgrading bootloader (besides when the ROM actually specifies the Bootloader version of firmware code?

dumitrudan608 said:
The problem is most custom ROMs don't actually tell you the firmware code or bootloader version. And I only saw 1 ROM that actually told me that it will update the bootloader to PIE (without specifying the actual version). Do you have any pointers on what should I look for when installing a custom ROM to prevent upgrading bootloader (besides when the ROM actually specifies the Bootloader version of firmware code?
Click to expand...
Click to collapse
The rom should say what firmware it is based on. Like N950FXXU5DBS2. If not you can ask.
Eg. N950FXXU5DBSA2 - the "5" in ....5DBSA2 is the bootloader version.
You'll can check for your bootloader version in download mode.
Here is a screenshot: (not mine just an eg.)
But you should be able to flash back to an oreo bootloader as long as the bootloader version is the same.

Cannot open PIE after OTA upgrade last Friday.
After upgrade with previous release and security patch of 1st of January I checked somewhere last week and there was n upgrade then.
Last Friday I did see a new OTA update from Samsung and installed it, upgrading to PIE.
After restart I get an error with the SIM card slot. I have a dual SIM version in Spain PHE.
I am unable to use phone now.
Everything original. Only did the dual SIM + memory card. Which has been working perfect for me with OREO.
Which version would I need?
Did the official PIE update change the bootloader version as well?
I just need the double SIM and the memory.
Any help would be greatly appreciated.

BluePhnx said:
What is your CSC?
Warning I haven't done this yet since I'm staying on pie. So do it on your own risk! I'm just saying what other people done.. Also I would've done it myself too.
Download the last oreo firmware for your CSC. (The one before Pie.)
Download Odin 3.13.1 or the latest version on computer.
Flash Oreo and home-CSC
But if it doesn't work or you get lots of force closures messages then do this steps.
WARNING!!!! this will erase all data off phone so backup FIRST!
Factory reset phone
Flash OREO with CSC file (NOT the home-CSC)
(What I've read people are saying to do the factory reset option for it to work. I haven't tried it myself since I'm staying in pie. That's why I included the first option.)
Click to expand...
Click to collapse
Thanks!
Not going to try it though lol i might just buy another one and give this to my family who is not bothered.

BluePhnx said:
The only connection the bootloader plays is when you go from pie to oreo.
For eg. Oreo is N950FXXS5CSA2
Pie is N950FXXS5DSB2
As long as the bootloader is the same "5" you can go back and forth between pie and oreo.
BUT once you go to a, for eg. let say August security patch for pie, firmware with N950FXXU"6"DSB4 (this has bootloader version 6) then you can NOT go back to oreo. Because the bootloader won't downgrade itself, it will only stay at version 6 or go higher to version 7 and so on.
So if you want to go back make sure the bootloader stays at version 5....
Click to expand...
Click to collapse
Is there a way to upgrade to Pie without chaning the Oreo bootloader so you can downgrade if you absolutely can't stand Pie?

edo101 said:
Is there a way to upgrade to Pie without chaning the Oreo bootloader so you can downgrade if you absolutely can't stand Pie?
Click to expand...
Click to collapse
No there isn't. That I know of.
Pie needs the pie bootloader.
I think the only way is to root your phone and have a dev port the pie firmware to work with the oreo bootloader. If possible!
But you "should" be able to flash the 1rst pie release firmware and then go back to the last oreo firmware with a factory reset. (Not certain though so. )

---------- Post added at 11:43 AM ---------- Previous post was at 11:37 AM ----------
BluePhnx said:
No there isn't. That I know of.
Pie needs the pie bootloader.
I think the only way is to root your phone and have a dev port the pie firmware to work with the oreo bootloader. If possible!
But you "should" be able to flash the 1rst pie release firmware and then go back to the last oreo firmware with a factory reset. (Not certain though so. )
Click to expand...
Click to collapse
1rst pie bootloader?
What about this one: N950U1UEU5DSC1

Odin to downgrade Samsung galaxy note 8

Hi,
I have updated my unrooted note 8 to the android Pie but unfortunately I didn't like the new awful UI also I missed some good features in android Oreo. So, is it possible to use Odin to downgrade unrooted note 8. I'm not interested to root it, just want to downgrade it to official Oreo.
One more question, I even liked Android Nougat than Oreo. So is it possible to downgrade from Pie to Nougat using Odin without rooting?
thanks

mdxii said:
Hi,
I have updated my unrooted note 8 to the android Pie but unfortunately I didn't like the new awful UI also I missed some good features in android Oreo. So, is it possible to use Odin to downgrade unrooted note 8. I'm not interested to root it, just want to downgrade it to official Oreo.
One more question, I even liked Android Nougat than Oreo. So is it possible to downgrade from Pie to Nougat using Odin without rooting?
thanks
Click to expand...
Click to collapse
You can go back to oreo as long as the bootloader is the same.
You'll have to do a factory reset though.
eg.
Oreo firmware: N950FXXS5CSA2
PIE firmware: N950FXXU5DSA2
Notice the 5 before "DSA2" and the "CSA2" that's the bootloader version. So since the pie and oreo firmware has the same bootloader version you can go back to oreo.
You can NOT go back to Nougat different bootloaders.
eg.
Nougat firmware: N950FXXU3BRA8
PIE firmware : N950FXXS5DSB2
Notice the 3 before "BRA8" and 5 before "DSB2" they don't match!
So the bootloader version 5 will NOT downgrade itself to version 3 therefore Odin will give you a failed error message.

To be is a different question . I have a problem, I want flash the rom with pie generic Spain, now I am in Vodafone pie and Odin always say fail, what can I do?, thanks.

pato66 said:
To be is a different question . I have a problem, I want flash the rom with pie generic Spain, now I am in Vodafone pie and Odin always say fail, what can I do?, thanks.
Click to expand...
Click to collapse
What is your csc?
Spain is PHE in multi-CSC OXM
Vodafone is ATL in OVF Csc firmware.
If you used home-CSC and it fails only option is to use the CSC file (this will delete data so backup first.)
The multi-CSC oxm doesn't have ATL csc inside so you'll lose any carrier specific features (maybe???) So do some research first.

CSC Questions
Hello everybody, I've found myself in the position of needing to downgrade from Pie back to Oreo also.
My question revolves around this "MYSTERIOUS" Samsung "CSC" designation, and the difficulties in verifying what I have vs what I NEED
I have an unlocked SM-N950U1 which is currently running on the Verizon network in the United States
I do NOT have any of the Verizion specific features, ie.... "My Verizon" or even "Verizon Visual VoiceMail"
the phone has also been on the AT&T network previously again with no carrier specific features there either.
Since the "secret code" for the dialer didn't work to reveal my CSC, and there is no carrier software version entry in my about phone software information to reveal the CSC either, I downloaded one of the generic "phone info" apps and it reports VZW as currently active CSC on the CSC tab, but then on the firmware tab in the CSC version location its reporting "N950U1OYM5DSC1" and I have found zero reference to an "OYM" CSC anywhere.
I have downloaded both the PIE and OREO variants of the "XAA" firmware for my Note 8
Does anybody have any idea if this is going to be the correct firmware to accomplish this downgrade without bricking this darn thing, I have no interest in root nowadays because the minuses out weigh the pluses and I really don't want to trigger knox and loose google pay or any of my banking apps, but I really do use and need to use the call recording capabilities that still worked in Oreo, and not anymore in Pie
Thanks in advance
Dan

BluePhnx said:
You can go back to oreo as long as the bootloader is the same.
You'll have to do a factory reset though.
eg.
Oreo firmware: N950FXXS5CSA2
PIE firmware: N950FXXU5DSA2
Notice the 5 before "DSA2" and the "CSA2" that's the bootloader version. So since the pie and oreo firmware has the same bootloader version you can go back to oreo.
You can NOT go back to Nougat different bootloaders.
eg.
Nougat firmware: N950FXXU3BRA8
PIE firmware : N950FXXS5DSB2
Notice the 3 before "BRA8" and 5 before "DSB2" they don't match!
So the bootloader version 5 will NOT downgrade itself to version 3 therefore Odin will give you a failed error message.
Click to expand...
Click to collapse
Hi, i just came to this conclusion! i am currently running N950FXXU7DSJ1 and odin always gives me error when i try to downgrade. no matter newest or older version. so there is no possible way to downgrade?
What if i unlock bootloader(if its possible for currently last version), change to custom recovery and install any custom rom(nougat?) and maybe flash bootloader via custom rom also? will this option be possible at all?

Safe to downgrade N9500 to oreo ?

Hi.
I just received the Pie update to my Note8 256GB.
First I would like to check the actual version of my phone. I assume it's simple a N9500, but I guess I need to double confirm. How can I be 100% sure ?
Second, current my band base shows N9500ZHU4DSE7. From what I have read, it should be bootloader 3. And normally I should be able to downgrade back to Oreo. I am just unsure how, and which firmware I should use.
Also if I downgrade, will I lose the phone internal data ?
Only reason why I NEED to downgrade : the software block to prevent using 2 sims and one sd card !

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 downloaded from updato yesterday.
Thing is, is doesn't seem to want to flash.. When I use the csc file Odin gets stuck at the recovery.img step. If I use the home_csc file, flashing starts, but is frozen at the start of the system step and nothing happens.
What is going wrong and what can I do?

mhamdyl08 said:
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 downloaded from updato yesterday.
Thing is, is doesn't seem to want to flash.. When I use the csc file Odin gets stuck at the recovery.img step. If I use the home_csc file, flashing starts, but is frozen at the start of the system step and nothing happens.
What is going wrong and what can I do?
Click to expand...
Click to collapse
You can downgrade to pie android 9.0 but not oreo since you jumped to android 10
Android 10 and android 9 pie is on bootloader 3 and oreo is on bootloader 2 & 1 so impossible to downgrade you Cannot go back to oreo.
Odin will fail to flash.

Trex888 said:
You can downgrade to pie android 9.0 but not oreo since you jumped to android 10
Android 10 and pie is on bootloader 3 and oreo is on bootloader 2 & 1 so impossible to downgrade you Cannot go back to oreo.
Odin will fail to flash.
Click to expand...
Click to collapse
As I previously mentioned, last year I managed to downgrade from Pie to Oreo. Anyway, I just downloaded Pie firmware and tried flashing it and it does exactly like I said above, using each csc file, freezes at its respective step.
What could be the problem? Odin?

mhamdyl08 said:
As I previously mentioned, last year I managed to downgrade from Pie to Oreo. Anyway, I just downloaded Pie firmware and tried flashing it and it does exactly like I said above, using each csc file, freezes at its respective step.
What could be the problem? Odin?
Click to expand...
Click to collapse
As previously mentioned you can downgrade, but only to an earlier version of Android if the bootloader version is the same as the one you're currently on.
So Oreo came with bootloader 1 and later versions had bootloader 2
Pie came with bootloader 2, 3 and last version had bootloader 4
Android 10 comes with bootloader version 4
So from Android 10 you may download to later version of Pie with bootloader 4 only.

mhamdyl08 said:
As I previously mentioned, last year I managed to downgrade from Pie to Oreo. Anyway, I just downloaded Pie firmware and tried flashing it and it does exactly like I said above, using each csc file, freezes at its respective step.
What could be the problem? Odin?
Click to expand...
Click to collapse
Try factory reset first from recovery before flashing
.use latest version of odin
Try reboot your pc and different usb cable.
I recommend you to use patched odin from link below
https://forum.xda-developers.com/attachment.php?attachmentid=4899843
Also regarding csc the firmware comes with 2 csc files so Don't use "HOME_CSC_OMC" file
just use " CSC_"OMC

paul_59 said:
As previously mentioned you can downgrade, but only to an earlier version of Android if the bootloader version is the same as the one you're currently on.
So Oreo came with bootloader 1 and later versions had bootloader 2
Pie came with bootloader 2, 3 and last version had bootloader 4
Android 10 comes with bootloader version 4
So from Android 10 you may download to later version of Pie with bootloader 4 only.
Click to expand...
Click to collapse
OK! can I downgrade the bootloader? i. e. from version 4 to 1?

Trex888 said:
Try factory reset first from recovery before flashing
.use latest version of odin
Try reboot your pc and different usb cable.
I recommend you to use patched odin from link below
https://forum.xda-developers.com/attachment.php?attachmentid=4899843
Also regarding csc the firmware comes with 2 csc files so Don't use "HOME_CSC_OMC" file
just use " CSC_"OMC
Click to expand...
Click to collapse
what if I lost my recovery after flashing an old one? always I got download mode instead of recovery