The term sometimes surfaces in gaming communities or as a misrendering of other brands:
Many online “expert” videos show people using the Fukbox for overhead weighted squats or as a bench for heavy dumbbell presses. The box is designed for vertical loading only (bodyweight plus minimal external weight). Lateral forces, like lying sideways on the box to press a barbell, will cause the top panel to snap.
If you bought a "Fukbox" from a non-official source labeled "Unlicensed," the pinout for the charge pump may be different. In that case, ignore this guide and demand the original build documents from the seller.
If Pin 8 reads 0V, your charge pump section is dead.