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Bard part number 8611-259 is an OEM USB memory stick supplied for Bard control and display service work, including loading approved software updates to the PGDx touch display used with Bard wall-mounted HVAC systems. Techs typically use this USB during commissioning or troubleshooting to keep the unit controls on the correct revision and to support reliable operation after an update. Because update procedures and file versions can vary by control platform, confirm your unit control model and the exact Bard update package before ordering 8611-259, and keep this USB dedicated to Bard update files to avoid compatibility issues.