Avidyne IFD540 Pilot's Manual page 201

Update Databases LSK
You will be prompted to "Confirm" or "Cancel". Assuming you
selected "Confirm", you should see a dialog box presented in the
middle of the screen and all uploadable files on that fob will be
individually listed and check marks may be visible next to each
file name.
Confirm and Cancel LSKs
Use the "Select All", "Un-select All" LSKs and the IFD knob as
required to ensure check marks are associated with all the
desired files to upload to the IFD. Now press the "Proceed" LSK
to begin the file upload.
6-25 General