Allen, Bryan. Bai dialect survey. 2007. sil16:48759
The source also gives a phoneme /ɴ̥/, but the only examples of it are before ɴ̩, so this is probably an allophone of another consonant.
Velars and uvulars are apparently contrastive: ŋa˦ 'diligent', ɴa˨˩ 'sweat'.