Firmware upgrades use the Network Local Time for scheduling.   Assume you have multiple sites around the global, each set to their local time based on where in the world they are located. If you schedule a firmware upgrade to 2am, the firmware upgrade will happen at 2am on each location, based on the Network Local time. So if you have a site in Australia and one in the US, each will upgrade at 8am their own local time. If all sites are set to the same Local Time, Firmware upgrades will hit all sites, regardless of timezones. SO if you upgrade at 2am in Australia, it will be 6pm in the US. ... View more