Firmware can be updated in PowerView software.
Help/Check for Firmware updates
Use this video instruction if firmware upgrade fails for some reason.
Download firmware version v2.0.3475; PowerMaster.v2.0.3475.zip
Load MicroBoot if firmware update fails and upload the firmware again.
Download MicroBoot; MicroBoot_MI2892.zip
*Note: MicroBoot can be uploaded over RS232 communication port only!