D500X Firmware version 2.1.3
To upgrade a D500X detector, the firmware file should be transferred to a FAT32 formatted CF card using the Transfer command of the D500X Utility program (copying the upgrade file to the CF card through Windows will not work). Then put the card in slot #1 of the D500X and turn the power on with the EXT/INT Power switch. The detector will automatically recognize the card as a “firmware upgrade” card. Follow the instructions on the display to perform the upgrade.
Download: D500X 2.1.3 (128 kB)
D1000X Firmware version 1.0.4
Firmware upgrade instructions can be found here.
Download: D1000X 1.0.4 (256 kB)
If download link does not work, right-click on link and select "Save target as...".