Viltrox released two firmware updates for the Viltrox EF-FX1/2 bringing the adapters up to version 2.29 which you can download here.
①Fixed the problem that after the adapter is upgraded to V2.28, IBIS of XH1 and X-T4 is not yet effective on a few lenses.
②Fixed the problem that X-H1 and X-T4 sometimes will appear to shut down and restart automatically.
③Fixed the problem that the aperture is occasionally out of control when taking pictures.
④Fixed the problem that the camera screen will flash after moving to the focus position, but get normal once shutter is pressed.
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Viltrox EF-FX2: B&H Photo / Amazon
Viltrox EF-FX1: B&H Photo / Amazon