I'm afraid that the only help will be from the radio manufacturer. The DVD is hardwired to work regardless of the digital interface
(Android or Windows CE
) and really has nothing to do with it.
Did you visit the HICES website?
You need to find the firmware to reflash the radio, either with Android or with Windows CE. And to be honest, I think flashing with the wrong operating system probably deleted your flash ROM system bootloader, probably reformatting the memory.
You need to somehow 1
) find comaptible software to match your hardware, and 2
) reflash your raido. There is no other workaround that I know of and others who have made the same mistake do not offer much in the way of help and most of them had to have the radio removed and sent back to the manufacturer.