I am running Stretch on a RPi 3 Model B with a Scandisk 16 GB SD. I recently purchased a Zymkey 4i. I’ve successful gone through the getting start steps and have confirmed that the Zymkey 4i is bound to the RPi (via the slow blinks).
My goal was to then encrypt the Root partition via Option 1. I first confirmed that 7 is the root partition and dev/sda is the FAT32 formatted USB key (32 GB). While running the Script for Option 1, it takes some time to complete (as the walkthrough suggests), but partway through, the Zymkey begins blinking rapidly (so it appears unbound). Also, once the script completes and the reboots have occurred, the Zymkey continues to blink rapidly. Additionally, I verified the device was no longer bound by shutting down the RPi, removing the Zymkey, and then booting up the device. I assumed if the encryption and binding was successful, the boot would fail without the zymkey, but everything booted fine. Again, the Zymkey WAS successfully bound prior to starting the encryption process, but seems to have become unbounded somewhere during the process.
Can someone provide some guidance on this?