10-03-2018 05:55 PM
See below support article.
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T490, TP 25 Retro, X1 Yoga 3rd Gen, W510 850 EVO, A30p
Retired 385D, A20p, A21p
10-05-2018 01:59 PM - edited 10-05-2018 02:11 PM
I have a M73 SFF, which uses the same BIOS as your E73. I will never update the BIOS via the OS update program. It's too easy to wedge the system if the Windows-based program fails part way through. 98% of the time, it can be recovered by moving the jumper with a CD or USB drive that has the BIOS stand-alone update tool loaded. But since it's out of warranty, that 2% is unnecessary risk of wedging it for good.
Best to go straight to the stand-alone update methods: CD is easy to burn and update from; the USB drive takes a bit more work. There's several good threads here on how to do that, search above right.