Both wiser have the same part number(5200WHC2) but different Device type
Wiser 2 with WiFi – wiser2firmware_1_32_102.img
Current C-Bus Home Controller (SLHC)
Wiser 2 without WiFi – SLHomeControllerFirmware_2_00_67.img
Firmware update is done via PICED but Alternatively, you can use the option Wiser Manual Update under the Settings from the Web Client and then choose one of the above files for the upgrade.