So we are here.
The SKY77629-21 that is in both china and international version of the OPO supports sub-band 20.
If we tweak it in quadcomm we can enable band 20 but it still dont work(there are some threads about that).
So as I see it the 77629-21 supporting some sub-band dont mean it supports the actuall band 20.
Looking at the datasheets this seems logical. Even if they arn't much to call datasheets they still tell us something.
If we change the 77629-21 to a 77629-51 we have support for band 20.
And when the amplifier AND quadcomm supports it, it should work. Or am I totally wrong?
Sure i't's a BGA 42pin but still, not impossible.
So with software AND hardware modifications we should be able to connect to band 20. 880-915mHz.