For update files, customer has to download the file via his account ID for the S/N of the device. The files from other devices will not be authorized to use on this device. Attached is the update manual for your reference. Please ask customer to follow the steps to update the tool.
By the way, MD802 can work with SanDisk 16G card. You can have a try. Also please remind customer to make backup of the SD card for future use in case update expires. Thanks!
Overseas Tech Support
Autel Intelligent Technology Corp., Ltd.