https://devzone.nordicsemi.com/f/nordic-q-a/122709/mtp-in-zephyrHi I&#39;m migrating applications I wrote using SDK 17 to nrfConnect 3.0 with Zephyr. I implemented USB devices with combined multiple USB classes. One of those classes was MTP which I had to implement myself because this was not supported. During thisen-USTelligent Community 13Fri, 04 Jul 2025 14:17:03 GMThttps://devzone.nordicsemi.com/thread/541488?ContentTypeID=1Fri, 04 Jul 2025 14:17:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aee916e1-3873-4555-a71c-ea9fe56eebb9SwRa<p>Hi Peter,</p> <p>I believe MTP is not supported in<span>&nbsp;the current or experimental Zephyr USB device stacks. The supported classes documented includes&nbsp;Audio, CDC ACM, CDC ECM, Mass Storage, HID, and Bluetooth HCI. See here:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/connectivity/usb/device_next/usb_device.html#built-in_functions">https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/connectivity/usb/device_next/usb_device.html#built-in_functions</a>&nbsp; So, it is likely that you would need to implement MTP yourself again. I will however check internally and confirm if that is the case and update here.</span></p> <p><span>In case you need to implement it, it is recommended to use the new USB device stack:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/connectivity/usb/device_next/usb_device.html#overview">https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/connectivity/usb/device_next/usb_device.html#overview</a>&nbsp;and&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/connectivity/usb/device_next/api/index.html">https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/connectivity/usb/device_next/api/index.html</a>&nbsp;</span></p> <p><span>Regards,</span></p> <p><span>Swathy</span></p><div style="clear:both;"></div>