Oh I actually got past this on a different switch:
dev:662020-05-04 12:26:18.512 pm debuglocked by:
dev:662020-05-04 12:26:18.453 pm warnUpdate failed to find a valid target
dev:662020-05-04 12:26:18.177 pm infocalculating crc...
dev:662020-05-04 12:26:17.886 pm infofirmware total bytes: 65536
dev:662020-05-04 12:26:17.882 pm infoSorted all the bytes. cleaning up some memory...
dev:662020-05-04 12:26:00.242 pm infoVersionReport- applicationVersion:1.17
dev:662020-05-04 12:26:00.226 pm infoVersionReport- zWaveProtocolVersion:4.33
dev:662020-05-04 12:26:00.011 pm infoFirmwareUpdateMd version:4
Current States
- manufacturerId : 2F00
- firmwareUpdateProgress : Failed to find matching firmware
- firmwareTarget : null
- firmwareUploadPercent : null
- currentFirmwareVersion : 1.17
- firmwareFragmentSize : 40
- firmwareId : FB3D
- lockedBy : None
I'm using this firmware: https://raw.githubusercontent.com/djdizzyd/hubitat/master/Drivers/Z-Wave-Firmware-Updater/Leviton-DZ6HD_01_20.hex