If your current settings menu includes an option to export the original MCU config or factory firmware, back it up to an empty SD card before starting.
Unlike high-end brands with simple web downloads, DHD units often require specific "flash" files ( 8 cap M cap B download firmware head unit dhd 4300 patched
This is a "soft brick." Try entering Recovery Mode (usually by holding the reset button while powering on) and performing a factory reset. If your current settings menu includes an option
: Most updates are performed by placing the .img or .bin file on a FAT32-formatted USB drive. or .app file).
Extract the downloaded patch file (typically a .bin , .img , or .app file).