Deliver custom Mercedes calibrations to your clients through D-Sync: AES-256 encrypted distribution, VIN-bound licensing, OLS NOREAD support, and flashing handled by the D-Sync app and D1 dongle — checksums are corrected automatically on the phone before every write, on every supported ECU, so you upload the raw calibration with no checksum step. Third parties cannot download the original calibration file. Apply: duke@yd-autogroup.com.