Samsung Galaxy Fold 6 is an amazing foldable phone and you can further extend its functionality by flashing a 3rd party ROM. This can done by flashing a custom recovery like Orange Fox recovery. This one is particularly made for the SM-F956B.
This recovery is flashable via ODIN and requires an unlocked boot loader. So, you should flash the custom recovery in this sequence:
Odin → AP slot → OrangeFox-q6q.tar → Start
Here are the features of this Fold 6 Custom Recovery.
Odin-flashable .tar.
adb root open — adbd runs as root: dmesg, /proc and adb pull /data/… all work
Official OrangeFox dark theme
Bash shell, nano, real sed/tar binaries, xz-utils, magiskboot for all image patching
FBE/metadata crypto stack included (keymint + gatekeeper AIDL HALs, qseecomd and vendor libs bundled into the ramdisk)
Samsung ARB (anti-rollback) workaround, AVB 2.0 patching, OTA stock boot.img backup
ORS (OrangeFox recovery scripts) support, quick backup of /boot and /dtbo
Magisk.zip bundled at /sdcard/Fox/FoxFiles/
If you a variant other than SM-F956B, consider flashing TWRP for Fold6 which is compatible with rest of the versions. Just keep in mind that flashing TWRP or OrangeFox recovery onto your Fold 6 will void all warranty. But you can flash stock recovery and the service center will never know that you modified software.