I have a ZD1200 with firmware 10.1 without problems, but a tried to downgrade the firmware from 10.1 to 10.0, after downgrade the firmware I just lost the controller, I cant ping it or access by any via. Any advise?
If you *do* save a backup before performing an upgrade, as we recommend/suggest, the ZD will acknowledge that you have a config from the previous version (ie 10.0) if you do a "downgrade" (upgrade to earlier version code) and ask if you want to use it.
You only lose the configuration if you downgrade but didn't have a saved configuration. Hopefully, it was saved before upgrading as advised/recommended, as it would need to be restored if config is lost by downgrading.