The only thing I see released by Yaesu USA on their website is version 1.3. Are you sure there is a version 1.6 available?
A while back I sent a support request to Yaesu asking about 1.6 upgrade and they said they didn't have it from Japan. I don't know if that has changed yet.
That is awesome! Now if they only will update the memory management.
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This software updates all previous versions to the present version 1.6 (2012-Sep).
Frequency 12.5kHz STEP operation
Correct the manual setting operation for the 12.5 kHz step frequency.
APRS LIST delete operation
Correct the MIC PTT key operations when transmit and receive information (BEACON and MESSAGE) are deleted from APRS.
Extension of the APRS transceiver display
The transceiver display is enabled to indicate the model name "TH-D72" when receiving a position packet from a Kenwood Corp. "TH-D72" transceiver.
Adds Voice announcement stop function of APRS Message
The APRS Message Voice announcement may be stopped by a key operation during the announcement.
DW Mode key operation
Correct the invalid key operation while receiving the DW priority CH. The key operation can now be carried out.
Firmware 1.6 USA has been released - on Yaesu's site
About god damn time. Maybe they do read this forum, after all.