rkflashkit.libusb1.USBError: LIBUSB_ERROR_IO [-1]

[renardroux]

Tried to use this with a Retron 5 with an rk3066 on Ubuntu 20.04. Here's what I see when starting the GUI from the command line:

Traceback (most recent call last):
File "/usr/share/rkflashkit/lib/rkflashkit/main.py", line 395, in __on_device_changed
partitions = op.load_partitions()
File "/usr/share/rkflashkit/lib/rkflashkit/rktalk.py", line 192, in load_partitions
self.__init_device()
File "/usr/share/rkflashkit/lib/rkflashkit/rktalk.py", line 152, in __init_device
prepare_cmd(0x80, 0x00060000, 0x00000000, 0x00000000))
File "/usr/share/rkflashkit/lib/rkflashkit/usb1.py", line 1145, in bulkWrite
return self._bulkTransfer(endpoint, data, sizeof(data), timeout)
File "/usr/share/rkflashkit/lib/rkflashkit/usb1.py", line 1129, in _bulkTransfer
raise libusb1.USBError(result)
rkflashkit.libusb1.USBError: LIBUSB_ERROR_IO [-1]

The device shows up, but nothing under NAND partitions. I will admit I am an amateur, so if there is some other way I should submit this or it is a "user error" sort of situation, just let me know. Thanks!