Hello @Marijus,
Thank you for your reply.
Yes I still manage to have SSH access (not all versions allowed me to get it but I manage to pinpoint versions that allowed me to keep this access).
Here is the result of the asked command line :
root@Teltonika-UNKNOW:~# mnf_info -mtnwbv
FFFFFFFFFFFF
000000000000
UNKNOWNXXXXX
0000
4.0.7
Thank you very much for your prompt reply !!
Best regards,
Francois