Thanks DanT
Is not help unfortunately for remote OS updates.
Because new OS eraising all MI and also network parameter's, then PLC system restart with all zero and you cannot connect it due PLC name , IP etc. all zeroes and no possible restore parameters just for reason unable to connection.
With previously OS updates was never eraising parameters, I'm using Unictonics PLC ~15Years and first time this issue popped up.
If you can physically make updates then is can set up back, but I have many abroad system's and canot update without on site helps what is very inconvenient due most consumers is end users and not PLC geek . Also is looking unprofessional.