New Edge and Chrome will block WinUSB 9x00 communication

Updated: Dec 18, 2020

Hi All


If you can't connect PUI when using Chrome and Edge, please follow the steps below:

  1. Open chrome and enter "Chrome://flags" Open Microsoft Edge and enter "Chrome://flags" , or "Edge://Flags"

  2. Enter "USB" in search flags

  3. Change the " Enable new USB backend" drop-down option to Disabled. Then relaunch the Chrome and Edge.



We found USB Firmware totally ignore all PUI command and it always return NAK, when using packet analyzer to capture the packet between USB Firmware and PC.

The USB backend function from Chrome cause damage to USB firmware, so needs to restart PC to recover .

There is the reason why PUI cannot be connected when using Chrome or Edge.


If you still have any questions, please don’t hesitate to inform us ,thanks.

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