Zooz USB S2 Stick 700

Been trying to update the stick to the latest firmware. I am getting the Firmware update failed: can’t open X modem session.

Using Simplicity Studio from Silicon Labs.

The stick is in firmware 7.13.


I would reach out to Zooz/@TheSmartestHouse customer service. They are usually very good and can help you.

I have, been back and for with them. No answer yet.

Thought I might ask here and see if anyone else have had this issue.


You are selecting OTW Update correct?

I assume that you have updated your install of Simplicity Studio.

That is correct on both.

They are having me send it back. They will flash it for me or replace it.

Love the amazing support at Zooz. Definitely my go to…

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