Hi Eugene,

Common issues are listed here: https://moosh.im/wiki/index.php/Upgrading_Firmware

Are you using iOS or Android? Some Android phones have an issue sending firmware uploads. If you have access to an iOS device (eg. friend’s phone) I recommend borrowing it for a minute and trying from there.

The other most common issue that causes firmware update failure is a low battery. Could that be the case here?

Best
~James