Wanted to try 6.20 + (old) permanent patch. Mostly for fun and to try again FuSa SD (since "FuSa SD for 6.3X v1.0.50b" does not really work nicely with 6.6X and sources can't be found).
Anyway the post was mostly to get info on this weird/unknown motherboard/module combination.
Almost everywhere I looked 04g is said to be down-gradable to 6.20 but this seems not to be the case with this mmotherboardb.
The only reference I found about TA-093v2/04g/6.30
is this table.