Viltrox 85mm f/1.8 V2 Firmware 1.2.4 released and can be downloaded here.
Firmware update instructions:
1. Optimize the stability of video tracking at small aperture.
VILTROX 85mm f/1.8 II: B&H Photo / Amazon
VILTROX 56mm f/1.4: B&H Photo / Amazon
VILTROX 33mm f/1.4: B&H Photo / Amazon
VILTROX 23mm f/1.4: B&H Photo / Amazon