Replaced Lenovo Motherboard- now Serial # and Model are Invalid in the BIOS

Greetings I recently replaced the MB in my K450 Desk Top-- (second time I had to replace it, first time was under warranty) I found an actual Lenovo branded replacement board spec'd for my machine, put it in, and it works flawlessly except... The problem is the BIOS reporting Serial # and Model as "INVALID". How can I update these values ?? The computer works fine with the exception of Office 365 asking me to (re) activate the software and I get 2 error beeps when booting up and a message about the model and serial.. I searched the American Megatrends site for help on this topic, but didn't find many solutions other than to re-flash the BIOS but even that wasn't clear whether I could update those values.. Any advice, suggestions ?

Lenovo generally accepts it, I don't see why they wouldn't...what type of a warranty do you have on this machine?
BTW, when you press F1 and enter BIOS, it's all there: somewhere in the very middle of the screen there's a row beginning with your machine type (say 7675CTO) and the next set of figures (no space in between)in the same row is your actual serial number.
Hope this helps. 
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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