often the beta BIOS sticky on the abit USA forums is the best place to get betas (after someone has been kind enough to supply us with a copy).
As a rule abit doesn't put betas on public ftps although it appears abit China sometimes does.
In terms of official abit final releases then the abit Taiwan site/ftp (usually the ftp is updated prior to them being linked on the site) is usually the best.
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