Hi Pulkit,
Thanks for the pointer! Technically the driver works BUT: it is so old that Windows 10 rejects the driver installation due to missing signing. I have to reboot and select some special options just to allow the installation of the driver.
I have tried to download the latest version of the VCP CP210x driver from https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx but the SRX300 device is not recognized correctly by this driver.
Basically Juniper needs to provide an updated driver for the VCP interface for all newer SRX gateways (300/320/340/345/550/1500).
Anyway - thanks again. This will keep it working for now. I will get in touch with Juniper regarding the missing driver.
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Best regards,
Jonas Hauge