Hey, I just updated my FW and ROM to the latest versions for A10 (FW 12.0.9.0, RR 8.6.9) up from RR 8.6.5 (unknown FW, probably one from around December 2019), and I have some issues with my proximity sensor. It worked perfectly before the update.
Basically, the sensor still works somewhat, detecting things infront of it, but it doesn't always switch off when the thing is no longer infront of it. I downloaded an app from the playstore called "Sensortest" that allows me to see exactly when it's on and off. So almost always when I go to unlock my phone it greets me with "Press and hold the power button to unlock", which means the proximity sensor is on, when it shouldn't be.
Is this a known issue, and is there any way to resolve it? Perhaps a patch, a module, or a custom kernel that could fix it? Maybe wiping cache or dalvik in TWRP (I didn't wipe anything when installing the new FW and RR)?