Dmx interface firmware upgrade to ver 3

I have downloaded the latest dll set but still had speed issues over usb. how can I upgrade to version 3 firmware
vellerman usb controlled dmx interface

I’m sorry - it is not possible to update the PIC firmware of the K8062/VM116.
The only way is to buy a newer K8062/VM116 version.
Please see: viewtopic.php?f=21&t=5528