PbHUB CH4 and CH5 cannot set to digital read?

  • Today I try to connect OP180 via PbHUB that using CH4 and CH5 but cannot be detected, I tried to erase and re-burn firmware by using M5 Fire it's show CH4 and CH5 read value (disconnected all CH) is not over 1000 .
    I checked with schematics seems CH4 and CH5 input is only Analog.
    Kindly confirm me as well before I send this unit to RMA process.