It was nothing about the mount points. The problem was kind of related to the firejail/sailjail, in terms of I needed the same two patches in the kernel. Once I added those two patches, the device booted up and the apps (with firejail/sailjail) also worked fine. (Well, except the weather because for a reason that cannot find any location.)
I think you will need to apply these two patches:
fs/statfs.c
fs/stat.c

Now, I am fighting with the AD. I've managed to start but so far cannot install any app.

Plus one more issue so far, the Bluetooth cannot be paired (so it doesn't work).

I'll keep you posted.