Code:
date code Quarter / Year Down-gradeable to 3.55 Firmware at that time Actual praxis
6A January, February, March / 2006 Yes
6B April, May, June / 2006 Yes
6C July, August, September / 2006 Yes 1.00
6D October, November, December / 2006 Yes 1.10, 1.11, 1.30, 1.31, 1.32
7A January, February, March / 2007 Yes 1.50, 1.51, 1.54, 1.60
7B April, May, June / 2007 Yes 1.70, 1.80, 1.81, 1.82
7C July, August, September / 2007 Yes 1.90, 1.92, 1.93
7D October, November, December / 2007 Yes 2.00, 2.01, 2.10 1.97
8A January, February, March / 2008 Yes 2.16, 2.17, 2.20
8B April, May, June / 2008 Yes 2.30, 2.35, 2.36
8C July, August, September / 2008 Yes 2.40, 2.41, 2.42, 2.43 2.16/2.30
8D October, November, December / 2008 Yes 2.50, 2.51, 2.52, 2.53 2.45
9A January, February, March / 2009 Yes 2.60
9B April, May, June / 2009 Yes 2.70, 2.76, 2.80
9C July, August, September / 2009 Yes 3.00, 3.01 2.70
9D October, November, December / 2009 Yes 3.10, 3.15
0A January, February, March / 2010 Yes 3.20
0B April, May, June / 2010 Yes 3.21, 3.30, 3.40
0C July, August, September / 2010 Yes 3.40, 3.41, 3.42, 3.50 3.40
0D October, November, December /2010 Yes 3.55 3.40/3.50
1A January, February, March / 2011 Sometimes 3.56, 3.60 3.55 or 3.56
1B April, May, June / 2011 No 3.61, 3.65, 3.66 3.60
1C July, August, September / 2011 No 3.70, 3.72
1D October, November, December / 2011 No 3.73, 4.00
2A January, February, March / 2012 No 4.10, 4.11
2B April, May, June / 2012 No 4.20
2C July, August, September / 2012 No 4.21
2D October, November, December / 2012 No
3A January, February, March / 2013 No
3B April, May, June / 2013 No
3C July, August, September / 2013 No
3D October, November, December / 2013 No
4A January, February, March / 2014 No
4B April, May, June / 2014 No
4C July, August, September / 2014 No
4D October, November, December / 2014 No
5A January, February, March / 2015 No
5B April, May, June / 2015 No
5C July, August, September / 2015 No
5D October, November, December / 2015 No
Manufacturing Date Used in USA/Japan there it is 7d.