How to reset the administrator password of the Vess R2600 series devices to the default password.
(Also confirmed to work on Vess R1840i unit)

Download attached .zip file.
(please make sure to rename the file to "OPAS_vr2k_resetpw.zip", it needs to have only OPAS in capitols, all other characters lower case, it will not work otherwise)

Copy it to the root folder of a FAT32 formatted USB drive.

Power on the Vess device, wait for it to boot up.
Insert the USB drive in the top USB port in the front panel of the device.
The device will start beeping and the LED on the USB slot will blink for a while.
Wait for the process to finish, remove the USB drive, done!
Login with default 'administrator' / 'password'

The USB stick will now contain an extra folder called OPAS_OUTPUT with 2 logfiles.

One servicereport file and a .txt file, the latter should show the password reset process.