ethernet not recognized in mikrotik LHG LTE

Hello!!

I am new to Mikrotik products and bit stuck right now.
I have recently bought a Mikrotik LHG LTE and while i had it initially installed and working properly with the initial configuration, suddenly it has stopped responding.

-only the PWR button is shown as active
-the other buttons are trying to open from time to time, like to trying to search for connections but never stabilize
-reset button is not actually working (from 5 to 20 secs tested)
-trying to reinstall RouterOS with Netinstall, but still the machine cannot be recognized.
-i have changed/tested with different ethernet and adapters.

Is there anything else to do, from software perspective? Anything else to check that i might be missing?


Thanks in advance!