[GUIDE] Viper4Android Driver Installation Error Fixed on A11/12/12.1 AOSP/OOS/COS ROMs - OnePlus 8 / 8 Pro & 8T Cross Device Themes, Apps &

1. Method
2. Method
Use Latest Unofficial Magisk Delta (if only 3. method didn't work.) and continue with 3. Step.
3. Method
Found this thread.
First install V4A apk, let it install the module and reboot once and then, basically copy these commands;
Code:
#!/system/bin/sh
# Kill audioserver PID if it was initialized already
SERVERPID=$(pidof audioserver)
[ "$SERVERPID" ] && kill $SERVERPID
mount -o bind /vendor/etc/audio_effects.xml /odm/etc/audio_effects.xml
magiskpolicy --live 'allow audioserver audioserver_tmpfs file { read write execute }'
magiskpolicy --live 'allow audioserver system_file file { execmod }'
magiskpolicy --live 'allow mediaserver mediaserver_tmpfs file { read write execute }'
magiskpolicy --live 'allow mediaserver system_file file { execmod }'
magiskpolicy --live 'allow audioserver unlabeled file { read write execute open getattr }'
magiskpolicy --live 'allow hal_audio_default hal_audio_default process { execmem }'
magiskpolicy --live 'allow hal_audio_default hal_audio_default_tmpfs file { execute }'
magiskpolicy --live 'allow hal_audio_default audio_data_file dir { search }'
magiskpolicy --live 'allow app app_data_file file { execute_no_trans }'
magiskpolicy --live 'allow mtk_hal_audio mtk_hal_audio_tmpfs file { execute }'
Into the file in "/data/adb/modules/ViPER4AndroidFX/post-fs-data.sh" and then reboot. Your V4A driver will start working, enjoy!
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Make sure to install AML if you are using other sound mods. Also here is another guide based on AML post fs file.

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I followed these steps but it didn't work, it keeps asking me to install the V4A driver every time I enter the App. Did I do something wrong?
Can you help me? It's too bad not to use V4A

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thibassinger said:
I followed these steps but it didn't work, it keeps asking me to install the V4A driver every time I enter the App. Did I do something wrong?
Can you help me? It's too bad not to use V4A
Click to expand...
Click to collapse
Replace your file with this and reboot. It works fine for me

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gsser said:
Replace your file with this and reboot. It works fine for me
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Click to collapse
It worked here! Thank you

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thibassinger said:
It worked here! Thank you
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Click to collapse
It was due to xda messing up while importing codes. Edited it back, should work fine as it is same with the sh file now

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Well if you find out a method for oos 12.1 then i will be grateful because this was working on oos 12 but they changed the locations of the files to this in oos 12.1
/odm/etc/audio_effects.xml and
/vendor/odm/etc/audio_effects.xml
If you have any ideas how to fix this driver loop on oos 12.1 then I'm all ears OnePlus 10 pro needs viper4android

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Has anyone managed to install V4A on a A12 Custom ROM?

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Extreme_Ninja2099 said:
Has anyone managed to install V4A on a A12 Custom ROM?
Click to expand...
Click to collapse
It works if you do it right...

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HessNL said:
Well if you find out a method for oos 12.1 then i will be grateful because this was working on oos 12 but they changed the locations of the files to this in oos 12.1
/odm/etc/audio_effects.xml and
/vendor/odm/etc/audio_effects.xml
If you have any ideas how to fix this driver loop on oos 12.1 then I'm all ears OnePlus 10 pro needs viper4android
Click to expand...
Click to collapse
Then you only need to change them to new path

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Thanks. I confirm it is working with evo a12 rom.

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gsser said:
Then you only need to change them to new path
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Click to collapse
I already tried it but it doesn't seem to work

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HessNL said:
I already tried it but it doesn't seem to work
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Click to collapse
just updated to 12.1 today, i'll let you know if i find a way to fix it

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gsser said:
just updated to 12.1 today, i'll let you know if i find a way to fix it
Click to expand...
Click to collapse
also on 12.1 but first time in years not able to install driver properly
curious what you gonna find out

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Not working for me oxygenos 12 oneplus 10 Pro still drivers not installed

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If anyone having issues with v4a on latest oos
Try this
Extract the content and replace the original one. And ser proper permissions.
I had severe issues getting it to work. So I'm not sure if the odm File was the issue or if the modified system/etc config File solved it. I just edited the original odm/etc and added v4a info same with system/etc files.
The above mod didn't help fully so hope this help
Just noticed i used my broken file in /vendor/ linked to odm/etc which don't include the uuid so it seems to be the system/etc that's needed

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ko_hi said:
If anyone having issues with v4a on latest oos
Try this
Extract the content and replace the original one. And ser proper permissions.
I had severe issues getting it to work. So I'm not sure if the odm File was the issue or if the modified system/etc config File solved it. I just edited the original odm/etc and added v4a info same with system/etc files.
The above mod didn't help fully so hope this help
Just noticed i used my broken file in /vendor/ linked to odm/etc which don't include the uuid so it seems to be the system/etc that's needed
Click to expand...
Click to collapse
You saved me tysm I was struggling to install v4a on my gt neo 2 because every time I rebooted I got the "no driver found" message and now it's working !!

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IgnisGuardian said:
You saved me tysm I was struggling to install v4a on my gt neo 2 because every time I rebooted I got the "no driver found" message and now it's working !!
Click to expand...
Click to collapse
Yes i might fix a zip for this

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Here's a magisk module repack
Just install the APK and flash this zip after don't let the APK install the driver it'll fail!
Flash this after installing app or before
It'll work without any hassle!
Enjoy!

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IgnisGuardian said:
You saved me tysm I was struggling to install v4a on my gt neo 2 because every time I rebooted I got the "no driver found" message and now it's working !!
Click to expand...
Click to collapse
Yes OOS had this issue too.
But after *ODM* Fix it was installed but didn't work until you enabled legacy mode.
And even then it would just stop the service after 10 seconds.
I've tested several method but only this worked for me.
But at least it works! (For now) until things are changed again

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Okay so I know this is OOS thread but has anyone tried this on MIUI 13?!
Edit: Will try this soon and report back.