10-31-2018 08:49 PM
I do not see any BIOS available for that laptop. It appears to be an older laptop that has been EOL(End of Life). Any available drivers will be at the below site.
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T490, TP 25 Retro, X1 Yoga 3rd Gen, W510 850 EVO, A30p
Retired 385D, A20p, A21p