VTwo Mini firmware upload requires two attempts

[arafey]

1st attempt

Finding device...OK
        Manufacturer: Nuvoton
        Product: HID Transfer
        Serial No: A02015081302

Reading data flash...OK
Verifying data flash...OK
        Device name: eVic VTwo mini
        Firmware version: 3.30
        Hardware version: 1.00

Verifying APROM...OK
Writing data flash...OK
Restarting the device...OK
Finding device...FAIL

2nd attempt

Finding device...OK
        Manufacturer: Joyetech
        Product: HID Transfer
        Serial No: A02014090304

Reading data flash...OK
Verifying data flash...OK
        Device name: eVic VTwo mini
        Firmware version: 0.00
        Hardware version: 1.00

Verifying APROM...OK
Writing APROM...OK

Works as expected except it has to run twice. The device is then unusable unless a second evic-usb upload is issued, which allows using the updated device.