Please see the following knowledge base article about updating your EarMix.
Link: https://support.presonus.com/hc/en-us/articles/360020435391-EarMix16M-Firmware-Update-Guide
Please see the following knowledge base article that shows you how to update the NSB.
Link: https://support.presonus.com/hc/en-us/articles/360020289011-NSB-Firmware-Update-Guide