Toa DP-K1 - Manual (Page 66)

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Step 5. Press the [Next] button, then the Check Firmware
Version screen is displayed.
When the unit with the firmware earlier than
version 2.00 is installed, such device is displayed
in the Uncontrollable Devices list.
Note
If the unit with the firmware earlier than version
2.00 is installed, it cannot be connected using this
setting software since it is not compatible with
multiple units connection function. Its firmware
should be updated. (See Step 6).
Step 6. If a unit with the firmware earlier than version 2.00
is detected, press the [Update Firmware Version]
button.
All units' firmware earlier than version 2.00 is
updated.
Turn off the unit's power after update completion,
then turn on the power again.