RC IN (SBUS) Stopped working after switch to plane 4.0.9 From copter

This cube Black was last used as a bench tester for Quadcopters, After flashing new plane 4.0.9 Firmware to it, the SBUS signal going through the RC IN is no longer recognized by mission planner or the cube in general I presume as I tried QGC and same thing.

Any help is much appreciated

Cheers Callum

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