Xhorse VVDI Mini OBD Tool Firmware Update Connection Failed Solution

Need to update Xhorse VVDI Mini OBD Tool firmware to v1.0.2 via WiFi, it failed me.  Error:  ‘Connection failed, try again after confirming configuration information error code:02’. Also tried updating via Upgrade kit, no luck.
Any idea?
Vvdi Mini Obd Tool Update Firmware 1Vvdi Mini Obd Tool Update Firmware 2
Vvdi Mini Obd Tool Update Firmware 3
Solution:
WiFi firmware update requires WiFi connection thru mobile phone.
Set phone Hotspot to 2.4GHZ, reconnect device and try again.