Hobbywing 120A 1s speedo

[Bosscat]

I seem to have done something to mine hopefully not terminal. I loaded the latest software to my program box and then loaded the V3 508 "blinky software to the speedo all seemed to go just fine so switched off and disconnected, plugged the speedo back into the rec and switched on I get a red light on the speedo for a while then a flashing green one accompanied by two beeps which keep repeating and nothing works. Sounds like the low voltage alarm but checked the voltage at the point where the power wires are soldered in and I'm seeing 4.2v
Any ideas how do I reset it or is it terminally cream crackered???