Ccornish3 Any suggestions on how to resolve this?
You need a very solid connection between the tablet and the ASIAIR to complete the first phase ("downloading") of the process. The second phase ("installing") is autonomous.
If your update is failing during the (second) "installing" phase, it may actually have completed installing, but not reporting because there is no solid connection to the tablet, or the ASIAIR has lost its station mode default and had resorted to hotspot mode.
Try rebooting the ASIAIR, and see if you can see the ASIAIR hotspot from the tablet. Bring your tablet within 1 meter of the ASIAIR just to be sure. If you can see the hotspot, connect the tablet to it to see if you can access it (and check on the version number).
When the ASIAIR boots up, you should first see the red power LED on the ASIAIR turn on, followed a short time later by rapid flashes from the green (storage activity) LED. If you do not see the green LED flash, or if it makes only one short flash, you probably need to restore the microSD card (the first and second generation ASIAIR), and redo the firmware update.
If your update is locking up sometime during the first (downloading) phase, try to get a better connection. If you are using the ASIAIR as the hotspot, place your tablet within 1 meter from your ASIAIR. If you are using station mode, place the ASIAIR within 1 meter from the router.
The most solid way is to download with the ASIAIR LAN port connected to an Ethernet adapter for an iPad (there are iPad Ethernet adapters for both Lightning and USB-C based iPads). Next best way is to connect the ASIAIR LAN port to your Router -- then access the ASIAIR from the tablet through the router (this is the method that I use -- I have a eero mesh router permanently connected to an ASIAIR; both are located inside a waterproof box at the base of my tri-pier that is left outdoors the entire year).
If you have lost WiFi access after the update, you can factory default the WiFi settings by using the WiFi reset button (in a hole on the second generation ASIAIR, so use a paper clip). After the WiFi reset, you would need to setup station mode, etc, so avoid doing a WiFi reset if you can.
The good thing with using the LAN connector (to either the iPad or the router) is that there is nothing you need to configure on the ASIAIR. Raspbian looks for a LAN connection all by itself. It is the only thing on the ASIAIR that is actually as simple as 1,2,3 (because Raspbian OS took care of it).