How can I check the panel and communication module (IP150/+, PCS, HDxx) firmware versions?

How can I check the panel and communication module (IP150/+, PCS, HDxx) firmware versions?

The firmware versions can be checked only if you are using the master code to login. Tapping on the 3 dots near the site ID (in the site list) and then tapping on the "i" (info) icon will present the site details. There you can find the communication module and panel firmware versions.
The firmware can also be checked from the "edit site" section, from the menu, after logging in with the Master code.