There was a Mandatory Update in November 2016 to update the devices to SHA-2. You can find the update to your device on the support page for your respective device.
Here is a copy of the email we sent out to all the admins.
Mandatory firmware update for Netbiter EC150 and EC250
Netbiter EC150 and EC250 must be updated to firmware version 1.40.0 before 1 November 2016.
Connection to Netbiter Argos will not be possible after this date with older firmware versions.
Firmware older than version 1.40.0 cannot be updated remotely after 1 November 2016.
TLS/SSL certificates are used to provide secure, encrypted communication over the Internet. These certificates have to be renewed on a regular basis. Since the SHA-1 cryptographic hash algorithm is deprecated, all new certificates will use the SHA-2 algorithm. Netbiter EC150 and EC250 with older firmware only supports SHA-1 so they must be updated in order to support SHA-2.
The latest firmware can be downloaded from the Netbiter support website.
The Netbiter Team