General A12 (S) released for unlocked

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Scragge

Member
Jan 24, 2016
22
1
Check your OnePlus updater.
Yes, A-12 has been released for the N200, but it may screw up your phone. I bought three of the unlocked US market 5g N200s due to the 3g phase out. Yesterday two of them updated to A-12 and now neither of them will work for voice /mms/sms. The phones detect a SIM installed but will not access the mobile network at all. I'm using Consumer Cellular which in turn uses At&T towers. Nothing I've tried makes any difference, can't even place a call on my brand new phones. OnePlus tech support is useless, their solution is send the devices to them for "repair" after their update broke my phones. After chatting with their rep I have 0% confidence they will actually do anything except keep my phone for a month or so and send it back in the same condition. According to their tech, no roll back tool exists for the unlocked variant.
 
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mingkee

Senior Member
Yes, A-12 has been released for the N200, but it may screw up your phone. I bought three of the unlocked US market 5g N200s due to the 3g phase out. Yesterday two of them updated to A-12 and now neither of them will work for voice /mms/sms. The phones detect a SIM installed but will not access the mobile network at all. I'm using Consumer Cellular which in turn uses At&T towers. Nothing I've tried makes any difference, can't even place a call on my brand new phones. OnePlus tech support is useless, their solution is send the devices to them for "repair" after their update broke my phones. After chatting with their rep I have 0% confidence they will actually do anything except keep my phone for a month or so and send it back in the same condition. According to their tech, no roll back tool exists for the unlocked variant.
S build based on Color OS and even the font changed.
I think I can deal with mine, but the most important of all, there's no player error on rooted N200 with S
 
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The12thJuror

New member
Jun 19, 2022
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Yes, A-12 has been released for the N200, but it may screw up your phone. I bought three of the unlocked US market 5g N200s due to the 3g phase out. Yesterday two of them updated to A-12 and now neither of them will work for voice /mms/sms. The phones detect a SIM installed but will not access the mobile network at all. I'm using Consumer Cellular which in turn uses At&T towers. Nothing I've tried makes any difference, can't even place a call on my brand new phones. OnePlus tech support is useless, their solution is send the devices to them for "repair" after their update broke my phones. After chatting with their rep I have 0% confidence they will actually do anything except keep my phone for a month or so and send it back in the same condition. According to their tech, no roll back tool exists for the unlocked variant.
THANK YOU for posting this!! My mom purchased an N200 for the exact same reason and after the A-12 update she's having the same issues with her device. All her voice, sms, and mms transmissions go through Cricket wireless (which also uses AT&T network) She contacted OnePlus customer service and they said they'd get back to her within 48 hours. It's now been 48 hours but with it being a weekend, she's hoping to hear back from them by Monday. She went to the Cricket store yesterday and they cleaned and tried a new SIM card to see if that might fix the issue but it didn't.

While it doesn't sound like there's any fix available yet, it's helpful knowing that this issue is affecting someone else using the AT&T carrier network. Hopefully between OnePlus and the AT&T wireless carriers they'll figure out a solution sooner rather than later.

Best of luck with your devices.
 
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Scragge

Member
Jan 24, 2016
22
1
THANK YOU for posting this!! My mom purchased an N200 for the exact same reason and after the A-12 update she's having the same issues with her device. All her voice, sms, and mms transmissions go through Cricket wireless (which also uses AT&T network) She contacted OnePlus customer service and they said they'd get back to her within 48 hours. It's now been 48 hours but with it being a weekend, she's hoping to hear back from them by Monday. She went to the Cricket store yesterday and they cleaned and tried a new SIM card to see if that might fix the issue but it didn't.

While it doesn't sound like there's any fix available yet, it's helpful knowing that this issue is affecting someone else using the AT&T carrier network. Hopefully between OnePlus and the AT&T wireless carriers they'll figure out a solution sooner rather than later.

Best of luck with your devices.
Yeah, I called OP three times got the same promise from OPs customer service and they never got back with me. I've never dealt with a less enthusiastic company when dealing with a serious product defect. The tech support people at first acted like the didn't believe me when I described the problem. Then once I had (I think) convinced them the problem was real, their response was like "oh well, too bad, so sad". OP offered no solutions or even ideas of what to try to do to fix the problem.

Do they test anything before pushing out an update?

I had a two day window left for returning the devices for a refund so now they're gone, and I'm gone as an OP customer, I can't just do without a phone while they fumble around trying to figure out the details for some (maybe) upcoming patch.

Good devices, terrible customer service. Never settle, nope, never again.
 

Travisholt92

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Jun 28, 2012
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For those of you who want to downgrade from 12 to 11, use fastboot enhanced/payload dumper, boot fastbootd, delete all of the "my_" partitions, flash android 11 ROM zip (payload.bin button). Reboot bootloader, use the command fastboot -w to initiate a factory reset, reboot recovery and wipe data (this fixes mismatching metadata/userdata partitions) reboot device and voila you're on Android 11 again. 👍 Confirmed on my converted TMobile variant.


Also T-Mobile variant got official A12 OTA with the same C.15 build number.

And AT&T doesn't play nice with OnePlus, their new sim cards will not let you use a OnePlus device at all because they are unsupported.
 

Tyreethetruth

Member
Jul 30, 2017
25
2
For those of you who want to downgrade from 12 to 11, use fastboot enhanced/payload dumper, boot fastbootd, delete all of the "my_" partitions, flash android 11 ROM zip (payload.bin button). Reboot bootloader, use the command fastboot -w to initiate a factory reset, reboot recovery and wipe data (this fixes mismatching metadata/userdata partitions) reboot device and voila you're on Android 11 again. 👍 Confirmed on my converted TMobile variant.


Also T-Mobile variant got official A12 OTA with the same C.15 build number.

And AT&T doesn't play nice with OnePlus, their new sim cards will not let you use a OnePlus device at all because they are unsupported.
Do you know where to download the A12(or at least the latest A11 update so I can update to A12 via OTA) stock firmware/update or could you upload it for the T-MO(metro) variant or show how to update OTA even when I unroot both slots the OTA still fails
 

Travisholt92

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Jun 28, 2012
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OnePlus 6T
Do you know where to download the A12 stock firmware/update or could you upload it for the T-MO(metro) variant or show how to update OTA even when I unroot both slots the OTA still fails
I'll get the link scraped today. To fix OTA you have to reflash the stock build to restore avb (android verified boot / vbmeta verification). Without this being restored you can't flash OTA's using the normal methods. But once I get a link to the T-Mobile/metro update, you can use fastboot enhanced to manually upgrade like I did. I'll make a tutorial for the manual upgrade/downgrade process. I first have to downgrade from OxygenOS 12 to 11, then use the MSMtool to restore stock T-Mobile software. Easy stuff 👍
 
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Tyreethetruth

Member
Jul 30, 2017
25
2
I'll get the link scraped today. To fix OTA you have to reflash the stock build to restore avb (android verified boot / vbmeta verification). Without this being restored you can't flash OTA's using the normal methods. But once I get a link to the T-Mobile/metro update, you can use fastboot enhanced to manually upgrade like I did. I'll make a tutorial for the manual upgrade/downgrade process. I first have to downgrade from OxygenOS 12 to 11, then use the MSMtool to restore stock T-Mobile software. Easy stuff 👍
Thank you! I been stuck on the same update like 4-5 updates ago 😂🤦🏾‍♂️
 

weirdfate

Senior Member
Nov 6, 2010
145
11
OnePlus Nord N200 5G
On this build (metro/TMobile version converted. I can't keep android auto connected. I went into developer options and selected the default to transfer files/ android auto and all the other options but it just connects for a few and then disconnected and says device unsupported.
Rooted device and using a alpine iLX-w650
 

Travisholt92

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Jun 28, 2012
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Thank you! I been stuck on the same update like 4-5 updates ago 😂🤦🏾‍♂️
The link to the download is literally a https link in the logcat when downloading the OTA. In case you're wondering how to manually download the zip onto a computer, that is how to get the link. If anyone else beats me to sharing the link it would save me from having to downgrade to get the link for the T-Mobile variant myself 😂
"adb logcat > logcat.txt"
 
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Tyreethetruth

Member
Jul 30, 2017
25
2
The link to the download is literally a https link in the logcat when downloading the OTA. In case you're wondering how to manually download the zip onto a computer, that is how to get the link. If anyone else beats me to sharing the link it would save me from having to downgrade to get the link for the T-Mobile variant myself 😂
"adb logcat > logcat.txt"
So I get on computer and go on bootloader and type "adb logcat"?
 

Travisholt92

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Jun 28, 2012
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Negative, while booted and after you start to download the android 12 OTA you can run the adb command to get the link while the OS is running.

(Shout out to @lzgmc )
I dirty flashed this (DE2118 T-Mobile/Metro) build over the leaked unlocked variant (DE2117) OxygenOS 12 build most are running and did not have to factory reset after flashing with Fastboot Enhanced.

My TMobile variant is now running the T-Mobile firmware. No downgrade required for that.

Downgrade process is download the android 11 build from OnePlus, boot fastbootd, use fastboot enhanced to delete all of the "my_" partitions, flash "payload bin" (full android 11 ota zip from OnePlus), make sure to tick ignore unknown partitions. After that is done shut the phone down and boot to fastboot/bootloader using the key combo, and flash the same payload again with ignore unknown partitions ticked. This will update the partitions that were inaccessible in fastbootd (such as modem). After this you will have to use a terminal with adb/fastboot to run "fastboot -w" this will wipe metadata(encryption key for userdata) and userdata. Reboot to recovery and perform factory reset there as well. After that you should be good to reboot to OxygenOS 11. To return to stock T-Mobile after that just use msmtool
 
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Tyreethetruth

Member
Jul 30, 2017
25
2
Negative, while booted and after you start to download the android 12 OTA you can run the adb command to get the link while the OS is running.

(Shout out to @lzgmc )
I dirty flashed this (DE2118 T-Mobile/Metro) build over the leaked unlocked variant (DE2117) OxygenOS 12 build most are running and did not have to factory reset after flashing with Fastboot Enhanced.

My TMobile variant is now running the T-Mobile firmware. No downgrade required for that.

Downgrade process is download the android 11 build from OnePlus, boot fastbootd, use fastboot enhanced to delete all of the "my_" partitions, flash "payload bin" (full android 11 ota zip from OnePlus), make sure to tick ignore unknown partitions. After that is done shut the phone down and boot to fastboot/bootloader using the key combo, and flash the same payload again with ignore unknown partitions ticked. This will update the partitions that were inaccessible in fastbootd (such as modem). After this you will have to use a terminal with adb/fastboot to run "fastboot -w" this will wipe metadata(encryption key for userdata) and userdata. Reboot to recovery and perform factory reset there as well. After that you should be good to reboot to OxygenOS 11. To return to stock T-Mobile after that just use msmtool
Alright cool thanks for the download 👍🏾 so just go to twrp/orangefox and install it or do I get on pc and flash it via adb? Does it have to only be fastboot enhanced?
 

Travisholt92

Senior Member
Jun 28, 2012
1,310
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OnePlus 6T
Alright cool thanks for the download 👍🏾 so just go to twrp/orangefox and install it or do I get on pc and flash it via adb? Does it have to only be fastboot enhanced?
PC and flash via fastbootd then again in fastboot after fastbootd. Fastboot enhanced is the easiest way to do it, otherwise you will need to fix custom recovery to support android 12 or use command line tools to unpack the oneplus ota file to manually flash each partition.
 

Tyreethetruth

Member
Jul 30, 2017
25
2
PC and flash via fastbootd then again in fastboot after fastbootd. Fastboot enhanced is the easiest way to do it, otherwise you will need to fix custom recovery to support android 12 or use command line tools to unpack the oneplus ota file to manually flash each partition.
Gotcha, how do I go to fastbootd and fastboot? Its confusing me which one is which
 

Travisholt92

Senior Member
Jun 28, 2012
1,310
1,187
30
Fort Wayne, Indiana
Honor 6X
OnePlus 6T
Gotcha, how do I go to fastbootd and fastboot? Its confusing me which one is which
fastboot = bootloader
Fastbootd has access to more critical partitions and can be accessed by the command "fastboot reboot fastboot" at the bootloader or by hitting the "reboot to fastbootd" button in fastboot enhanced. Make sure to flash it in fastbootd BEFORE flashing it again in fastboot
 

Tyreethetruth

Member
Jul 30, 2017
25
2
fastboot = bootloader
Fastbootd has access to more critical partitions and can be accessed by the command "fastboot reboot fastboot" at the bootloader or by hitting the "reboot to fastbootd" button in fastboot enhanced. Make sure to flash it in fastbootd BEFORE flashing it again in fastboot
Gotcha, one last thing how do I flash using fastboot enhance? Idk what to pick to flash the A12 OTA

EDIT: Nvm I extracted the update and found the payload
 
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    For those of you who want to downgrade from 12 to 11, use fastboot enhanced/payload dumper, boot fastbootd, delete all of the "my_" partitions, flash android 11 ROM zip (payload.bin button). Reboot bootloader, use the command fastboot -w to initiate a factory reset, reboot recovery and wipe data (this fixes mismatching metadata/userdata partitions) reboot device and voila you're on Android 11 again. 👍 Confirmed on my converted TMobile variant.


    Also T-Mobile variant got official A12 OTA with the same C.15 build number.

    And AT&T doesn't play nice with OnePlus, their new sim cards will not let you use a OnePlus device at all because they are unsupported.
    1
    Check your OnePlus updater.
    Yes, A-12 has been released for the N200, but it may screw up your phone. I bought three of the unlocked US market 5g N200s due to the 3g phase out. Yesterday two of them updated to A-12 and now neither of them will work for voice /mms/sms. The phones detect a SIM installed but will not access the mobile network at all. I'm using Consumer Cellular which in turn uses At&T towers. Nothing I've tried makes any difference, can't even place a call on my brand new phones. OnePlus tech support is useless, their solution is send the devices to them for "repair" after their update broke my phones. After chatting with their rep I have 0% confidence they will actually do anything except keep my phone for a month or so and send it back in the same condition. According to their tech, no roll back tool exists for the unlocked variant.
    1
    Yes, A-12 has been released for the N200, but it may screw up your phone. I bought three of the unlocked US market 5g N200s due to the 3g phase out. Yesterday two of them updated to A-12 and now neither of them will work for voice /mms/sms. The phones detect a SIM installed but will not access the mobile network at all. I'm using Consumer Cellular which in turn uses At&T towers. Nothing I've tried makes any difference, can't even place a call on my brand new phones. OnePlus tech support is useless, their solution is send the devices to them for "repair" after their update broke my phones. After chatting with their rep I have 0% confidence they will actually do anything except keep my phone for a month or so and send it back in the same condition. According to their tech, no roll back tool exists for the unlocked variant.
    S build based on Color OS and even the font changed.
    I think I can deal with mine, but the most important of all, there's no player error on rooted N200 with S
    1
    Yes, A-12 has been released for the N200, but it may screw up your phone. I bought three of the unlocked US market 5g N200s due to the 3g phase out. Yesterday two of them updated to A-12 and now neither of them will work for voice /mms/sms. The phones detect a SIM installed but will not access the mobile network at all. I'm using Consumer Cellular which in turn uses At&T towers. Nothing I've tried makes any difference, can't even place a call on my brand new phones. OnePlus tech support is useless, their solution is send the devices to them for "repair" after their update broke my phones. After chatting with their rep I have 0% confidence they will actually do anything except keep my phone for a month or so and send it back in the same condition. According to their tech, no roll back tool exists for the unlocked variant.
    THANK YOU for posting this!! My mom purchased an N200 for the exact same reason and after the A-12 update she's having the same issues with her device. All her voice, sms, and mms transmissions go through Cricket wireless (which also uses AT&T network) She contacted OnePlus customer service and they said they'd get back to her within 48 hours. It's now been 48 hours but with it being a weekend, she's hoping to hear back from them by Monday. She went to the Cricket store yesterday and they cleaned and tried a new SIM card to see if that might fix the issue but it didn't.

    While it doesn't sound like there's any fix available yet, it's helpful knowing that this issue is affecting someone else using the AT&T carrier network. Hopefully between OnePlus and the AT&T wireless carriers they'll figure out a solution sooner rather than later.

    Best of luck with your devices.
    1
    Do you know where to download the A12 stock firmware/update or could you upload it for the T-MO(metro) variant or show how to update OTA even when I unroot both slots the OTA still fails
    I'll get the link scraped today. To fix OTA you have to reflash the stock build to restore avb (android verified boot / vbmeta verification). Without this being restored you can't flash OTA's using the normal methods. But once I get a link to the T-Mobile/metro update, you can use fastboot enhanced to manually upgrade like I did. I'll make a tutorial for the manual upgrade/downgrade process. I first have to downgrade from OxygenOS 12 to 11, then use the MSMtool to restore stock T-Mobile software. Easy stuff 👍