  Let $c\phi_{k}(n)$ be the $k$-colored generalized Frobenius partition
function. By employing the generating function of $c\phi_{6}(3n+1)$ found by
Hirschhorn, we prove that $c\phi_{6}(27n+16)\equiv 0$ (mod 243). This confirms
a conjecture of E.X.W. Xia. We also find a congruence relation
$c\phi_{6}(81n+61) \equiv 3 c\phi_{6}(9n+7)$ (mod 243). Moreover, we show that
$c\phi_{6}(81n+61) \equiv 0$ (mod 81), $c\phi_{6}(243n+142) \equiv 0$ (mod 243)
and $c\phi_{6}(729n+ 547) \equiv 0$ (mod 243). We further conjecture that for
$n\ge 0$, $c\phi_{6}(243n+142) \equiv 0$ (mod 729).
