te copio lo que he puesto en XDA pero nadie lo ha probado, yo paso que ahora piro. Si nadie se lo mira ya lo hare yo maņana:
Try to change this in the registry(probably after you install version 3.5 or it wont work):
[HKLM\Software\Microsoft\.NETCompactFramework]
now make sure that 3.7.8345.0.0 is set to value 0 and 3.5.xxx is set to 1... this should enable .net framework 3.5 instead of 3.7
