well, they are being really kind to offer you that since this is all chuwi’s fault and not theirs.
with that being said, i think chuwi screwed up big time… i fear the 64 bit batches are a different, newer hardware revision so the bios is not compatible with the 32 bit one. that’s the only logical explanation as for why there is no update out yet, despite the 64 bios rom and bios existing already
if i were you, i would accept the swap immediately