It seems that most new Nintendo Wii units come with this updated controller which means thmost Nintendo Wii units produced after February 2007 cannot be modded with the current generation of chips.
So if you want to buy a Wiinja, you must know if the chip supports your console. Thanks to a Wiinja forum member named Vixen, this is possible without to open your console. It seems the first part of the serial number holds the key to knowing if you have the incompatible D2B chip or not.
(This method is not 100% accurate, the only way to be sure is opening the console)
Check your serial number against the tables below.
Europe
GC2 - DMS or GC2R - D2A (Compatible with first generation mod chips)
GC2R - D2B (Incompatible with first generation mod chips)
For European models it seems the D2B chip was introduced somewhere between LEH 1091XXXX and LEH 109225XX.
North America
GC2 - DMS or GC2R - D2A (Compatible with first generation mod chips)
LU 100XXXXXX
LU 101XXXXXX
LU 102XXXXXX
LU 103XXXXXX
LU 104XXXXXX
LU 1050XXXXX
LU 300XXXXXX
LU 301XXXXXX
LU 302XXXXXX
LU 303XXXXXX
LU 304XXXXXX
LU 305XXXXXX
LU 306XXXXXX
LU 502XXXXXX
LU 503XXXXXX
LU 504XXXXXX
LU 505XXXXXX
LU 506XXXXXX
LU 5074XXXXX
GC2R - D2B (Incompatible with first generation mod chips)
LU 1047XXXXX
LU 1054XXXXX
LU 3072XXXXX
LU 50853XXXX
LU 5089XXXXX
For North-America it appears that there are three different ranges in use (LU1/LU3/LU5). Its possible that each range is used in a different area, factory or language pack. Each range will have a number where the D2B chip is introduced.
For LU1 this seems to be between LU 104XXXXXX and LU 1054XXXXX.
For LU3 its between LU306XXXXXX and LU3072XXXXX and
for LU5 its somewhere between LU 5074XXXXX and LU50853XXXX.
Australia
GC2 - DMS or GC2R - D2A (Compatible with first generation mod chips)
Japan
GC2 - DMS or GC2R - D2A (Compatible with first generation mod chips)
GC2R - D2B (Incompatible with first generation mod chips)
Keep in mind that it is possible that there are different factories or production lines that use different stocks.
Therefore the above tables could be wrong at some points. It is also possible that a console's DVD initially failed the Quality Checks and has been shipped with a new DVD player that has the D2B chip. Thiswould only apply to serials that are in the danger zone.
However, so far the serial number seems to give a reasonable indication of what chip is inside your console.