Try reflashing the image using a FAT32 USB.
Download the U2W_Update.img from here http://112.74.112.110/download/2020-01-22/ and put it on a completely empty FAT32 USB stick. Plug the USB stick into the dongle, then plug the dongle into an iphone charger...not the car...and wait for both LED's
I have done this before, the image from the download site lets you upgrade via USB but not downgrade.
I followed these instructions. At first there were no LED lights. After a few seconds, the red light came on. After another 30-60 seconds, both lights came on. Does that mean the update is complete and I can unplug all and try the dongle in the car again?