Downgrade Firmware from U9 to U4 for patch certs SM-G975F - Samsung Galaxy S10+ Questions & Answers

Hey
I want to downgrade my Samsung galaxy S10plus SM-G975F.
My device was running on Android 9 and was IMEI repaired. But I just flashed it with Android 10 Latest firmware without knowing the circumstances and after the update the network are not working.
I searched and find that network patch can be done in U4 and below but I have flash it with U9.
Now I want to downgrade it to U9
Please help...

need u9
can you share where did you download u9 firmware for this g975f

Firmware location
chicknician01 said:
can you share where did you download u9 firmware for this g975f
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I have downloaded it from sammobile

No need to downgrade firmware patch cert is now working on latest security

Need Guidence
majinawaz said:
No need to downgrade firmware patch cert is now working on latest security
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Hello majinawaz, Can you please guide me or provide me any link ?

ahmermunaf said:
Hello majinawaz, Can you please guide me or provide me any link ?
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+1 @majinawaz

ahmermunaf said:
Need Guidence
Hello majinawaz, Can you please guide me or provide me any link ?
Click to expand...
Click to collapse
Hi @ahmermunaf , did you find any solution?
Or @majinawaz can you provide a link to yours?
THX!

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How to downgrade from Nougat to Marshmallow in Zenfone 3 Laser?

Somebody please guide me how to downgrade from N to Marshmallow?
atf2m4 said:
Somebody please guide me how to downgrade from N to Marshmallow?
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Same problem ..
please help..
atf2m4 said:
Somebody please guide me how to downgrade from N to Marshmallow?
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Root Your Device -> Download Marshmallow Official ROM from Asus Website -> Flash it
aswindivakar100 said:
Root Your Device -> Download Marshmallow Official ROM from Asus Website -> Flash it
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The MM rom available from the official site it's not an installer but am un update firmware.

Baseband Problems

My problem is that the baseband is unknown, I have flashed the firmware stock 6.0.1 and 7 and the problem continues, I have also flashed the NON-HLOS.bin and everything remains the same
My phone is Moto G4 Plus XT1644
Can anybody help me?.... btw I have another moto g4 xt1644 in 100% working condition in case that can help
Sorry for my bad english
_PaPaUpA_ said:
My problem is that the baseband is unknown, I have flashed the firmware stock 6.0.1 and 7 and the problem continues, I have also flashed the NON-HLOS.bin and everything remains the same
Can anybody help me?
Sorry for my bad english
Click to expand...
Click to collapse
What was your firmware before flashing the 6.0.1 firmware? What baseband was shown? Which device model do you have?
Did you follow this guide to flash stock firmware 7.0 june security patch https://forum.xda-developers.com/moto-g4-plus/how-to/stock-rom-npjs25-93-14-4-march-1-t3608138 ?
What was your firmware before flashing the 6.0.1 firmware? What baseband was shown? Which device model do you have?
Click to expand...
Click to collapse
I do not know, because I bought it on ebay and already had the baseband problem
Did you follow this guide to flash stock firmware 7.0 june security patch https://forum.xda-developers.com/moto-g4-plus/how-to/stock-rom-npjs25-93-14-4-march-1-t3608138 ?
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Yes I did
_PaPaUpA_ said:
I do not know, because I bought it on ebay and already had the baseband problem
Yes I did
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did you tried to flash June Firmware ?
siddhesh9146 said:
did you tried to flash June Firmware ?
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Yes I did
_PaPaUpA_ said:
Yes I did
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https://mega.nz/#!RcglmbQY!SDmhLEDo9DGtSj03fArY1moKQlguKDywo5dYcr90uC4
Try to flash this Nougat baseband/radio in TWRP

VNS-l23c605b121 to android 7.0

Hi I have a p9 lite with the VNS-l23c605b121 compilation and I want to upgrade to 7.0. Does anyone know how to do that or if there's any problem to upgrade to the VNS-l23c605b120 compilation of android 7.0? I know that the main diference is that the 120 is the dual sim...
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use Firmware Finder.
there are guides here on the forum
Johnny TDN said:
use Firmware Finder.
there are guides here on the forum
Click to expand...
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Yes but all of them are for the B120 and not the b121.
Johnny TDN said:
use Firmware Finder.
there are guides here on the forum
Click to expand...
Click to collapse
Specially whats the next update OTA for my actual firmware.
batatin92 said:
Hi I have a p9 lite with the VNS-l23c605b121 compilation and I want to upgrade to 7.0. Does anyone know how to do that or if there's any problem to upgrade to the VNS-l23c605b120 compilation of android 7.0? I know that the main diference is that the 120 is the dual sim...
Thanks in advance.
Click to expand...
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batatin92, were you able to update to Android 7? I´m running the same firmware L23C605B121 and I´m not sure which firm should I update from Firmware Finder. Thanks

Can I flash official oreo 8.1.0 from SM-J730FM into SM-J730F/DS without damage it?

Can I flash official oreo 8.1.0 from SM-J730FM into SM-J730F/DS without damage it?
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Best regards.
Yes U can.
Agrim720 said:
Yes U can.
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Hi, I commented it into j7 j5 pro 2017 telegram group and they told me that doesn´t be flashed. I don´t know what´s the problem.
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Best regards.
But when trying to install a J730FM ROM on J730F/DS, I got two errors:
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Downgrade Nokia 6 TA-1021 from PIE/9

hi everyone i update my ta-1021 to pie and after that i facing manny problems ... i find this video on youtube, wich teachs a way to downgrade ta-1021
video link:
https://www.youtube.com/watch?v=wZhNBwHvqIE
has anyone tried it? is it possible?
milwakii said:
hi everyone i update my ta-1021 to pie and after that i facing manny problems ... i find this video on youtube, wich teachs a way to downgrade ta-1021
video link:
has anyone tried it? is it possible?
Click to expand...
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Yes it could be, but make sure to backup your data then you can carry on..it will simply downgrade your bootloader and recovery of your phone and then your phone is able to get updates because recovery is downgraded .. and download firmware from there use patched ost tool and flash it ..
Emmykay223 said:
Yes it could be, but make sure to backup your data then you can carry on..it will simply downgrade your bootloader and recovery of your phone and then your phone is able to get updates because recovery is downgraded .. and download firmware from there use patched ost tool and flash it ..
Click to expand...
Click to collapse
so thats mean i can even downgrade to 7.1.2 ?
because it best rom without any problems and bugs for nokia 6 2017
milwakii said:
so thats mean i can even downgrade to 7.1.2 ?
because it best rom without any problems and bugs for nokia 6 2017
Click to expand...
Click to collapse
You can downgrade it to 7.1.1 too..
But i will suggest you to downgrade it to oreo it's more stable than nougat and pie (maybe but it's my experience so i am sharing it with you )
downgrade question
Is it possible to downgrade even if the oem unlock bootloader not able to be unlocked?
riswan3 said:
Is it possible to downgrade even if the oem unlock bootloader not able to be unlocked?
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Yes
Plz tell me the process
Try This
milwakii said:
hi everyone i update my ta-1021 to pie and after that i facing manny problems ... i find this video on youtube, wich teachs a way to downgrade ta-1021
video link:
https://www.youtube.com/watch?v=wZhNBwHvqIE
has anyone tried it? is it possible?
Click to expand...
Click to collapse
Hi there,
I wrote an article on how to downgrade you Nokia 6 2017 model to the stock firmware. Please visit my page and you'll find the post
How to Flash Nokia 6 stock firmware 7.1.1 by KIBS2173
https://forum.xda-developers.com/general/help/how-to-reinstall-nokia-6-stock-firmware-t3884876
Regards
KIBS2173

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