Cannopt upgrade from Ver 247 to 250

I pressed the upgrade button under devices to upgrade my Flukso FL03001461 from Ver 247 to 250 but it doesn't want to upgrade itself.
Here is the data after pressing upgrade:

The FLM with serial FL03001461 will be upgraded to firmware version 250 at the next FLM heartbeat.

Serial Version Resets Last heartbeat Uptime Operations
FL03001461 250** 57 07 Sep 2018 14:01:07 0d 19h

Here are the readings an hour & 10 min later after the next heartbeat:
Serial Version Resets Last heartbeat Uptime Operations
FL03001461 247 57 07 Sep 2018 15:01:15 0d 20h remove upgrade

I did it number of times over the weekend. Still the same ver 247 without the upgrade.
Any ideas?