Did you pull the microSD card before performing a soft shutdown of the ASIAIR and powering the Raspberry PI off first? That could have corrupted the card, and ApplePi-Baker simply cloned the corrupted disk, so you now have two non-functioning microSD cards.
Before doing anything else, try mounting the microSD card on your Mac again. You should be able to see a volume called BOOT show up. Unless you run extFS on the Mac, you will not see three other volumes in extFS 4 format; but don't worry, you won't need to open them to do a restore.
In the BOOT volume, you should see a zwoair_license file. Copy that to your Mac. Stash it away in a safe folder and lock it in Finder. This will give you the fastest way to recover in case of future mishaps.
Also copy ASIAIR_Config.txt if you want to keep the same WiFi related configurations in the future (often the only way to switch between 2.4 GHz and 5 GHz bands when the ASIAIR gets confused -- which it often does).
Eject Boot so that it is less confusing in the next step (else you end up with two BOOT volumes on your desktop).
Next, go to the ZWO page that astronoob has linked to. Download the ASIAIR image from the Google server. Be sure to download the correct one -- ASIAIR Pro and ASIAIR (RPi 3 version) require different images.
Be forewarned that this would take a while -- ASIAIR does not expand images on the fly and the image is close to the full 32 GByte.
Once downloaded, you can open the image and it will again show a volume called BOOT. I believe the download is missing the license file. So, copy the license file that you had stashed away into this BOOT volume. If there is already a ASIAIR-Config.txt file in BOOT, just leave it alone to use the ASIAIR default. If the config file is missing in BOOT, copy the one you had stashed away.
Now, use ApplePi-Baker to burn a new microSD card by selecting your just edited IMG file. This might take about 15 minutes.
The firmware version on the Google drive is probably quite old (probably v1.3 for the ASIAIR Pro). So, ASIAIR app will ask permission to update the firmware.
If you are using WiFI, make sure your iPad is no more than a meter away (no kidding) from an ASIAIR Pro's metal box, and select the ASIAIR's hotspot.
The more secure way to update firmware (and use ASIAIR) is to connect the ASIAIR box to your home router with an Ethernet cable; then connect the iPad to the ASIAIR through the home network.
If you have an Ethernet adapter for your iPad (Lightning or USB-C depending on model), you can also connect the ASIAIR directly to the iPad for the fastest and most reliable connection between the ASIAIR app and the ASIAIR hardware. Then select Ethernet in the iOS Settings.
Just make sure you have a solid connection between the iPad (where the new firmware sits) and the ASIAIR box before attempting a firmware update.
If everything works, save the edited IMG file too, since this can come in useful for the future.