I pulled this information off the web (wiki) for RDF members to quickly reference the different hardware and software versions of Valentine One detectors over the years:
Each hardware version has an associated software version with it. Thanks to mrkookm, hardware refers to the internal components.
As of 16 September 2014, the colored bolded versions are current.
Hardware Version 1.85:
3.894 - TMF2 for blind spot vehicles, Improved Euro Mode with wider K band range to cover lower frequency photo radar in Europe
3.893 - ESP Programming, the changes were the V1 ID went from a '9' to 'A', checksums went to all packets
3.892 - Added ESP
3.891 - Traffic Monitor Filter added
Hardware Version 1.8: This platform with Crystal Tuning became identified as "1.8A" beginning with 3.851 thru 3.873
3.873 - Traffic Monitor Filter Beta
3.864 - Added Euro X band (may have been Beta tested on 3.863)
3.851 - Crystal Tuning added, Digital Temp Control ('A' Designation on the FCC ID)
3.821 - Added Euro Mode; POP2 version introduced;
3.819 - Beginning of 1st GEN POP
3.818 - Added POP detection; beginning of 1st GEN POP
3.817 - POP Beta
3.816 - POP Beta
3.813 - last pre-POP model
3.812 - Factory Test mode introduced (pre-POP/POP Beta)
3.619 - New case, new horn design, new logic board (radar and laser boards integrated into 1), new front and rear laser sensors, new face display
Hardware Version 1.7:
2.879 - K Band AutoMute timing extended to a max of 30 sec.
2.849 - Added K Band AutoMute, AutoMute over-ride, and K Band rear muting with max of 10 sec.
2.391 - new case, same horn, additional logic board (for laser), front laser sensor, super wideband Ka coverage; Cost of laser sensing V1 $400 MSRP
Hardware Version 1.6:
1.36 Later model had Front Laser and SuperWide-Ka
1.36 - First model, no superwide Ka Band detection (covers 34.2 to 35.2 GHz only), no laser detection; $299 MSRP
Please share generalized data (not just instances that only your RD has encountered) associated with each version so others can see how the versions have changed over time. For example, the version when the ESP was introduced and when the POP2 was introduced.
1. Added comment to 3.891
2. Added comment to 3.892, added comment to 3.813
3. Comments in this color -- courtesy of VanMan ; 04 Feb 2012
4. Comments in this color -- courtesy of kpatz ; 04 Feb 2012
5. Comments in this color -- courtesy of DUI Elite ; 02 Feb 2012
6. Comments in this color -- courtesy of snoopyC4 ; 02 Feb 2012
7. Comments in this color -- courtesy of jdrew; 03 Apr 2012