HOW TO UPGRADE YOU WEBACK APP TO TUYA-BASED APP for EXVAC880/EXVAC890

Read before operation (V.240101):
*EXVAC880 and EXVAC890 have different firmwares, please choose the corresponding firmware based on the robot model you have;
*A laptop with wireless function is required;
*It's suggested to shut down the anti-virus program before you download the firmware package, in case the firmware package might be killed by the anti-virus program; 
*Please read and follow up the instructions step by step, it's not possible to revert the firmware back to WEBACK after you transfer it to TUYA-based version.