Fingerprint sensor does not work with unlocked bootloader

[RainingTerror]

Having some issues while trying to root my 7T, I followed the guide here and everything seemed to work perfectly until I tried adding a fingerprint, at which point I was met with this message. It comes up straight away before I can even attempt to press the fingerprint sensor.

I thought maybe I did something wrong and went back to stock, but I still encountered the issue. I then re-locked the bootloader and the fingerprint sensor became fully functional again. I've tried to search for solutions but I can't find other people experiencing this on the 7T.

I've also tried using a different OS, I went with MSM Xtended v12.0 which allows the fingerprint screen to open but it won't actually register any touches at all.

I've seen mention of a fix to the error relating to persist.img on other Oneplus phones but I'm unsure if this would apply to me seeing as the sensor works perfectly with a locked bootloader, basically I'm stuck at this point and would appreciate any advice

 

[jcotterman]

I have an unlocked bootloader and have no issues with my sensor. TMobile converted to International.

Revert to stock and try again.

 

[RainingTerror]

I have an unlocked bootloader and have no issues with my sensor. TMobile converted to International.

Revert to stock and try again.

Yeah it seems to be working perfectly for everybody else on this device which is why I'm so confused.
I've gone from MSM Extended back to stock OOS 10.0.8 (HD65BA) and I still get the same error that's in the OP, I've now re-locked the bootloader and it's back to working again

 

[Macusercom]

Yeah it seems to be working perfectly for everybody else on this device which is why I'm so confused.
I've gone from MSM Extended back to stock OOS 10.0.8 (HD65BA) and I still get the same error that's in the OP, I've now re-locked the bootloader and it's back to working again

It can be that something in /persist is broken. It happened to several others too but mostly it is a user error. This message pops up if the fingerprint sensor calibration data is missing or broken. You can try this guide to try to fix it (unless you have a persist.img backup which you can use): https://forum.xda-developers.com/on...de-fix-persist-img-loss-finger-print-t4125909

Keep in mind that the MSM tool doesn't touch /persist so using it isn't going to fix the issue if it due to /persist. But first try to unlock your bootloader again and see if this error pops up again. Maybe it fixed itself