Viltrox released two firmware update for the Viltrox EF-FX1/2 in quick succession. Version 2.24 “Fixed XH1 lens error BUG”, which was followed by Version 2.25 that “Solved the autofocus problem of Canon EF-24-70MM F2.8 L IS II.”
You should only need to download Version 2.25 for the Viltrox EF-FX2/1
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Viltrox EF-FX2: B&H Photo / Amazon
Viltrox EF-FX1: B&H Photo / Amazon