An update for CrumProg with a support of S3CC921 chip series (SECDP-5 type) is available for downloading. Supported cartridges:
Xerox Phaser - 4600, 4620, 4622
MLT-D309 - Samsung ML-5510/6510,
MLT-D307 (ML-4510, 4512, 5010, 5012)
MLT-D309L - (Samsung ML-5512ND/6512ND)
An updated manual is available for downloading in the Files / Manuals
There is also a video material on S3CC921 chip resetting in the Files / Video