thingy:91 A request for the USB device descriptor failed.

[Alex.]

I've noticed that Thingy:91 USB code has some issues related to proper handling attach/detach events resulting in incorrect response to usb host requests. Windows device manager states that "A request for the USB device descriptor failed."

It happened several times already and the only solution is to power off/on device.

Device is updated with thingy91_ltem_dfu_2019-11-29_d3130d77.hex
AT%HWVERSION: E244

[Hakon]

Hey,

What OS are you using (Windows 7, 8, 10 etc.)? Have you flashed the latest version of the USB UART bridge image (thingy91_nrf52_usb_uart_bridge_dfu_2019-11-29_d3130d77.hex)? It can be downloaded here.

[Alex.]

I use Windows 10 latest patch level, however I don't think it related to host OS. If device is rebooted, windows will recognize it.

Versions I got when connected device to nRF cloud:

Modem Firmware mfw_nrf9160_1.1.1

Board nrf9160_pca20035

App Version v1.1.0

I didn't flash bridge, coz I'm not sure if I can do it with nRF Connect Desktop programmer. Is it just change the switch and use SW4 btn?

[Hakon]

Alex. said:

I didn't flash bridge, coz I'm not sure if I can do it with nRF Connect Desktop programmer. Is it just change the switch and use SW4 btn?

 The procedure should be described in this blog post I believe. You need to install mcumgr.