Sometimes, the hardware is too old to accept new firmware. Purchase a CANbus decoder, which comes with "auto-adapt" technology that learns the vehicle's CANbus signal over 50 ignition cycles.
: Download the correct protocol box upgrade software (typically an .iap or .can file) and copy it to the root directory of a USB flash drive. hiworld canbus update download
Even with the correct , issues can arise. Sometimes, the hardware is too old to accept new firmware
: Because these files are often not publicly pushed to end-users, it is common to receive a direct download link (such as Dropbox ) from the seller of your head unit upon request. hiworld canbus update download