I’ve installed Protools HD v7.3.x and it regonizes that the the SyncIO has the wrong firmware, but doesn’t give an “Update Firmware” button.

Digidesign has changed the method of updating the firmware on the SyncIO with v7.3 or later.

To update your SYNC I/O firmware:
1) Connect the SYNC I/O to the Digiserial port of the core card in your Pro Tools system.
2) Pro Tools software must NOT be running.
3) Launch the Digitest application.

Mac HD > Applications > Pro Tools > Pro Tools Utilities > Digitest
-or-
Local Disk C: (system drive) > Program Files > Digidesign > Pro Tools > Pro Tools Utilities > Digitest

4) In the Digitest application, click on the Synchronizer Firmware Tab, and choose the slot containing the HD Core Card in the pop-up menu.
5) Select DigiSerial Port and click Begin Update.
6) Navigate to the Sync I/O Firmware file

Mac HD > Applications > Pro Tools > Pro Tools Utilities > SYNCfirmware111.SYC
-or-
Local Disk C: (system drive) > Program Files > Digidesign > Pro Tools > Pro Tools Utilities > SYNCfirmware111.SYC

7) Follow the onscreen instructions to complete the update.
Note: If you receive a message that the SYNC I/O firmware update aborted, do the following:
1) Make sure the SYNC I/O is properly connected to the DigiSerial Port on the HD Core card and that the slot containing the HD Core card is selected in DigiTest.
2) Power cycle the SYNC I/O and repeat the update steps.
(Taken from the “Read Me” which documents compatibility details and known issues for using SYNC I/O with Pro Tools 7.3.0)

http://www.digidesign.com/index.cfm?navid=54&langid=100&itemid=24082

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