• After upgrading the firmware to v1.5.0, it is not able to downgrade to an earlier version of the firmware.
  
• The XP2-MAPB-H model cannot downgrade to firmware version v1.4.3 or lower.
  
• The XP2-GKDPB model with hardware v1.2.0 or higher cannot downgrade firmware to lower than v1.4.3. The hardware version can be checked in the DEVICE menu of BioStar 2.
  
• Devices with the new BLE chip cannot downgrade to a lower version after upgrading the firmware to v1.3.1 or higher. Devices with existing BLE chips can be downgraded to a lower version.
  

For more information, check the serial number of the device and contact the Suprema (https://supremainc.com).