Unfortunately I have no knowledge of this platform.
In general, the necessary sqlite binaries are included in the same folder where the Plex executables are stored. You’d need to find out this information somehow on your NAS. Perhaps from some startup script which is starting up the various software on that device.
Here is an older thread, which unfortunately doesn’t include an exact description of the method that helped the user in the end. But maybe you can gleam enough from it: Server unavailable after updating to version 1.40.3
