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The pinout of some Headsets delivered by Sony Ericsson are known to use a different pin layout. The layout of the HPB-20 is as following (unconfirmed, measuring the pins shows some strange interconections):
This pinout is not compatible to Neo. To use this headsets you have to rewire them which requires soldering or usage of a simple adater doing the transformation (however, i currently do not know of any existing).
The following sections describe the modifications made to a headset originally delivered with a P910i (HPB-20).
The modification can be made with the following steps (take care to have a quick but steady hand, the soldering on the image is quite dirty because i had to solder several times):
The mic should work, but this was not tested so far.