Estimote deployment app fails to update firmware of UWB Location Beacons

I was trying to use the “Deployment” app to update beacons.

(By the way, as an aside the Deployment app is awesome - makes managing multiple beacons so much easier!).

I selected “Remote Fleet Management”, then checked the “Update firmware” option.

It could see that all 4 UWB beacons needed a firmware update and connected to each in turn (the lights flashed on all 4 in turn). But then it said that all updates failed.

I was, however, able to update the firmware of each beacon individually using the “Estimote” app.

Phone: iPhone 6
iOS version: 11.2.1
Estimote Beacon firmware: 4.12.6

I downloaded all the Estimote apps today so I assume they’re all latest.