We've run into this a couple of times now at different locations.
We're a legacy Red partner and have begun some installs of Purple switches. We're running into an issue that I'm hoping someone can help with.
When upgrading the firmware on out of the box Summit X460-G2s we noticed that after the reboot, all the configuration information was gone. Stacking, VLANs, IP addresses, etc. At the time, we attributed it to the initial firmware on the switches; the CLI prompt showed "Software Upgrade Required".
Today, one of our team went to a site where we had previously installed a X670-G2, and did a firmware downgrade - 15.7.x to 15.6.x. When the switch rebooted with the downgraded firmware, the configuration was gone.
Is this normal behavior? If so, then how do you upgrade the FW remotely if the config has to be reapplied?