Ewon flexy firmware update crash

one day or another, he suddenly stopped working,
now i’m trying to do a recovery with firmware 14.2S0

and get this error ( see picture)

I have also tried this with other firmware versions, but got the same result

SN: 2011-0031-21

Hello @Harrykoolen,

Due to the nature of your case, please create a ticket at HMS Support Portal (hms-networks.com) and an agent from your region will be looking at your case closely.

Thanks in advance,