I’d already tried rebooting the meter with the reset button. It’s not in shipping mode because I can connect to it and use it as a meter.
I’ve tried new batteries, rebooting my phone and using a different phone.
When I use the released Android app, I can reprogram it back to 1447458797. I’ve installed the beta Android app on another phone with the same results. Based on this, I think the problem is the app not correctly detecting OAD mode following a meter reboot.