nas 540 infected by .mars ransomware

Cenkc

Hello everyone
My Zyxel nas 540 system was destroyed by the .mars virus. 
All files got the .mars extension. 
I did a long search on the internet about the subject, 
but I couldn't find a method to decipher the files.
I would like the help of friends who have experienced the same problem and found a solution. .

ikubuf

You can reset your NAS and recreate a volume if you have do backup on your NAS.
It is not secure to open a file that is encrypted by the ransomware.
And I'll suggest you not to use public IP on the NAS, it is more safety to put a NAS behind a router or a firewall.