I purchased a new Chuwi Ubook X via AliEXpress on June 7, 2024. The tablet serial number is YUbokXCW3H240103953.
The USB type A port on the tablet has stopped working properly. I have uninstalled the root USB node in Windows device manager and detected the device again, but the type A port still does not work. The USB-C port does work.
Further investigation reveals that USB 3.0 devices connected to this port are recognized. Only USB 2.0 devices cannot be used. As per specification, the USB 2 and USB 3 data buses use different pins on the connector, and completely separate differential pairs for signaling, so something is wrong with pins 2-3 on that port. The USB C port does detect USB 2 devices with an appropriate adapter and/or hub.
All the BIOS settings have been reset to default. Additionally, the computer still does not detect devices attached to the USB A port when booted from a USB stick, either Windows recovery or a Linux live image. This is unlikely a driver issue or the operating system itself. The tablet will not boot from a USB 2 thumb drive when attached to the USB A port.
Please advise on repair or replacement. I am very knowledgeable on computer repair if it is necessary for me to replace parts myself.