1 = reset device settings to firmware defaults and restart (see warning below) 2 = erase flash, reset device settings to firmware defaults and restart 3 = erase System Parameter Area in flash (Wi-Fi calibration and related data) and restart (see warning below) 4 = reset device settings to firmware defaults but retain Wi-Fi credentials and restart 5 = erase all flash and reset parameters to firmware defaults but keep Wi-Fi settings and restart 6 = erase all flash and reset parameters to firmware defaults but keep Wi-Fi and MQTT settings and restart (Erase of flash can take a few seconds to complete and there is no output during the erase process on the serial or web console) 99 = reset device bootcount to zero For reset 3and reset 1, device must be power-cycled in order to load new Wifi System parameters.
For 
IoT an der WVSS 