I bought a jj50 from KPrepublic and flashed it with the qmk, using the qmk toolbox and the qmk configurator. Yesterday when I booted the OS, the keyboard did not work, but when I unplugged and plugged the USB back in, the OS recognized the keyboard and it returned to working normally. However, today when I tried to repeat the same process, the OS did not recognize the keyboard (neither in the window nor in Linux).
Here the dmesg usb output when I plug in the keyboard:
[ 3797.283994] usb usb2-port6: attempt power cycle
[ 3797.911881] usb 2-6: new low-speed USB device number 52 using xhci_hcd
[ 3797.912454] usb 2-6: Device not responding to setup address.
[ 3798.116486] usb 2-6: Device not responding to setup address.
[ 3798.323872] usb 2-6: device not accepting address 52, error -71
[ 3798.437878] usb 2-6: new low-speed USB device number 53 using xhci_hcd [ 3798.438480] usb 2-6: Device not responding to setup address.
[ 3798.644480] usb 2-6: Device not responding to setup address.
[ 3798.851862] usb 2-6: device not accepting address 53, error -71
[ 3798.851989] usb usb2-port6: unable to enumerate USB device