. The "3555" is a specific hardware serial number often found on older "CDP Pro" or "CDP+" clones. Technical Summary: Autocom CDP BT (Serial 3555) Device Type

Users often encounter discrepancy between the physical label and the internal hardware: Sticker vs. Software : A label may show a 4-digit serial (e.g.,

grep -r "serial.*3555" /var/log/ | head -n 1

The unit’s pairing list is full (max 8 devices for Top models). Fix: Perform a factory reset by pressing the recessed button near the serial number label for 10 seconds. The LED will flash blue three times.

CDP BT Unit – Serial No. 3555 (Top View)