Doosan D35S-5 Service Manual page 345

Recovery
On G-scan PC Utility Main Screen, select , then G-scan Data and O/S files
saved in the SD card will be recovered to the initial state as follows.
<Figure 11: Run G-scan Recovery>
Unknown Error during Recovery function
<Figure 12: Error during Recovery>
This is the message shown when unknown error is occurred during Recovery.
Check if the drive of SD card is found. Retry the Recovery function again.
D439E Service Manual 343 5. Service Tool