Hello Christian! I believe these logs indicate a possible bad or unsupported optic. This article is for the 7520 but the log is the same: https://extreme-networks.my.site.com/ExtrArticleDetail?an=000126908
Hello @Olevetti , I apologize, this just came to my attention and is something i can help with! ---The new boot recovery password with length < 16 is: NEnDwWXo7Bl7The new boot recovery password is: NEnDwWXo7Bl7ACoVssUCSg==---You can use the above rec...
If your hardware supports 21.X then you can upgrade from 16.1.1.4 to 21 without any issues.
Downtime will depend on your process of upgrading and (again) the hardware platform. What is the hardware you are trying to upgrade?
