If your BP 330 has navigation, map-specific updates are handled through the Blaupunkt Naviextras Portal Dealer Support:

Operating systems and smartphone integration protocols change rapidly. Keeping your head unit updated ensures you get the best performance out of your audio system.

Expands file compatibility for newer audio and video formats via USB or SD card.

Ensure the files sit in the main root directory. Re-verify the USB is formatted to FAT32, not NTFS or exFAT. Update Progress Freezes Cause: Corrupted download file or a faulty USB drive.