The following is the change history log for XRT Pro Tuners that was previously hosted by H&S Performance before they closed down. The information listed is for tune file versions used by the 6.6L Duramax LMM.
Current Version: 6.6.19
6.6.19 Sept. 26, 2014 – ECM RPM limited to 3200 for emissions removed tunes
6.6.18 Aug. 19, 2013 – Internal firmware updates
6.6.17 June 19, 2013 – Internal firmware updates
6.6.16 April 10, 2013 – Street series tuner firmware updated (1031)
6.6.15 Jan. 24, 2013 – Street series tuners supported (version 1030)
6.6.14 Jan. 9, 2013 – Firmware 1023, DPF delete modified to High Sulfur text, Log files added, Auto detect firmware update added, SD card communications updated, Power level names changed – Stock, Tow, Street, Performance
6.6.13 Nov. 20, 2012 – Show Settings tech menu fixed
6.6.12 Nov. 15, 2012 – SD communications updated, Show Settings screen modified for more info, Firmware 1.02.2
6.6.11 June 19, 2012 – Medium duty truck surging addressed
6.6.10 May 30, 2012 – Firmware 1021 capable, Install download text changed
6.6.9 Dec. 14, 2011 – Reduced engine power messages addressed
6.6.8 Oct. 17, 2011 – P0299 DTC adjusted, Easy Tuning available, Cold idle surge adjusted
6.6.7 Speed limiter bugs fixed, P0087 tuning changes
6.6.6 Tuning changes for increased HP, Medium Duty calibrations defined
6.6.5 Idle "lope" "fixed
6.6.4 Surging issues addressed
6.6.3 Additional medium duty part numbers recognized
6.6.2 DTC P0106 addressed
6.6.1 Initial release software