Hybrid inverter locked up and showing strange error code

[freeflow]

Hi i got apparently a clone POWLAND 3000Kva 2400w 24v 230vac Solar Inverter 40A MPPT Solar Charger 25A Charger,
My hybrid inverter is showing this fault code [20] with a warning triangle, please see attached picture. It is now not working at all, no outgoing voltage just showing fault code but the fan is working, all the incoming voltages are good, but it has locked up.
This code is not in the manual, so I was hoping somebody knows what this means.
Thanks

 

[mopat]

Old error. Any way to update software?

Have you powered down completely, solar, battery, AC and restart? Factory reset.

Could be shorted battery cell, timed out on charging cycle.

 

[freeflow]

Old error. Any way to update software?

Have you powered down completely, solar, battery, AC and restart? Factory reset.

Could be shorted battery cell, timed out on charging cycle.

Not sure if you mean odd instead of old, but I restarted and at the moment it is working, but still concerned about what it could be.