The HMC6350 Motherboard has an External Clock input connected to the AFE chip through a multiplexer, but it can not be selected through the the configuration GUI, i.e. there is no such option in the dropdown list, like there was for the HMC6450 version. Also there is no possibility to manually switch the MUX_SEL lines on the board to select the External Clock. Can you please suggest a solution? Is there an updated GUI application that supports this? Thanks!