How to update the firmware for my solax charging box?

Please refer to Steps below:
The Charger supports the function “Upgrade”. Please follow the steps below to upgrade the device:
Contact the SolaX post-sales staff to obtain the Upgrade File;
Transfer the file into a USB Flash Disk (USB 2.0 or later is required);
Insert the USB Flash Disk, tap “Yes” to jump to “Reset” page. The upgrading process will start automatically.
Note: Please DON'T shut down the device, DON'T remove the USB flash disk, and DO keep it being plugged in all the time while upgrading, or the upgrade will fail.