“when downloading the software, the selected SMARTBOX serial number is different from the SMARTBOX serial number currently used. Please re-select the same serial number and download the software to upgrade again or contact the dealer.” How to fix the error？

Device Show in This Guide:
Launch X431 PAD V

Procedures:
For this error you need to re-download and install AutoSearch software agin.
Select “Other Modules”–>”Files”–>”Internal Storage”

Go into path cnlaunch/X431PADV/9898900038…/DIAGNOSTIC/VEHICLES
Then select “AUTOSEARCH” folder,and press “Delete”

Now go back to main menu to select “User Info”–>”Settings”

And select “Clear Cache” to clear the cache

After device restarting,select “Software Update” at main menu,and login your account
It will show the software you are possible to update
Select “AutoSearch”,then press “Update” button

Downloading,then install it automatically.

After then test Launch X431 again,it will work normally.

https://www.obd2tool.com/goods-10428-Launch-X431-PAD-V-PAD5-Full-System-Professional-Diagnostic-Tools.html