If I recall well, all your Zigbee devices will be deleted/gone. Not sure thought if they will be still fixable via maintenance action / hopefully someone with most recent experience will tell.
In any case, best would be to save all devices IDs and then use it if required - check out more here : [HOW-TO][Pro][Cloud] - Tool to FIX (advanced) flows after removing and re-adding devices
Btw, I wonder, why reset ?
