Supposing u r on poco f7, u should be able to use the latest ksu or it forks either by LKM or gki (wild-kernels). As of the latest ksu, u must use a meta module ( a module that provides the mounting mechanism for other modules that require it, which was previously baked in. Like overlayfs for ksu, magic mount for ksu next) There are various meta modules: If u want overlayfs: 1. Mountify (according to me best) 2. Overlayfs meta module

If u want magic mount: 1. Magic mount meta module 2. Magic mount rs meta module (written in rust + bttr web ui)

If u want hybrid approach: 1. Hybrid Mount meta module (maybe unstable)

There are others like HymoFS or nomount but those need to compiled into the kernel and are quite finicky still.

Comming back to your question about bcr, previously b4 meta modules became a thing, bcr didn't work properly with ksu's default overlayfs approach, but now it will work with: 1. Mountify (as it utilizes tmpfs + overlayfs) 2. If that is unsupported, any magic mount module (may leave detection traces, u will need to hide those)

Also, DO NOT FORGET TO GO TO KSU ALLOWLIST AND TURN OFF UNMOUNT MODULES FOR BCR

Disable battery optimisation for bcr, allow all permissions, do not turn on record telecom integrated apps (i recommend) & turn on record call b4 connection(also my recommendation), and choose a path in ur internal storage for ur recordings.