Sharp PN-L803C Service Manual page 138

4) Click [Firmware update].
Current firmware version of pen adapter
5) Click the button of folder selection, select from a folder tree the folder on which firmware data is placed.
Folder can be selected
6) In "Update data", the firmware data in the folder is listed.
Select one firmware data for updating, then click [OK].
PN-L803C_80TC3 FIRMWARE UPDATE PROCEDURES 5 - 15