I have owned a 20X for a few months, bonding a WAN source, a Cat4 SIM, and a USB-connected phone to a FusionHub located at AWS. After the learning curve, this has been flawless and a joy.
Deciding to upgrade, I added the Cat18 module and a Puma antenna.
Observation 1: when the Cat18 is inserted and the box is booted, the message “Remote SIM component is incompatible to the firmware” is displayed at the bottom of the Dashboard page of the 20X. The message disappears when the Cat18 is removed. The message reappears when the Cat18 is added.
Observation 2: Many experiments here, so abbreviations are needed.
*Cat4 + USB + WAN: bliss - all sources participate in the PepVPN (assessed via Live Status view).
*Cat18 with no other devices or SIM cards attached: data flows through the PepVPN; WIFI IP compatible with AWS.
*Cat18 + USB: only the USB participates in the PepVPN; WIFI IP compatible with AWS.
*Cat18 + WAN: only the WAN participates in the PepVPN; WIFI IP compatible with AWS.
*Cat18 + Cat4: only the Cat4 participates in the PepVPN; WIFI IP compatible with AWS.
*Cat18 + Cat4, but Cat4 is “Disconnected (Manual)” via the software: PepVPN will not start, all WIFI IP is compatible with SIM card provider.
A good mystery for someone … (both 20X and Fusionhub are 8.1.0, 4938 and 4940, respectively).