Quote from Lagoskon;
"It is the naming from Microsoft that sometimes the numbers are misleading.
The 19400,19701,19900 are test builds from HTC.
The 19202,19209 are from AT&T . And the 19213 is the final official Ship ROM for Kaiser.
If you check the AKU this 19213 build is 1.0.4 .And the rest builds were 1.0.0 and 1.0.2 . So this built is newer than every else , its from AT&T (19202>19209>19213) and latest AKU 1.0.4"