Usually, when you buy a New Laptop/PC it will have an OEM Windows Product Key, this Key will be stored in the Firmware (BIOS Chip) of your Device and if you want to repair your BIOS the Key will Removed, so here I will show you how to keep this Key or move it to your New BIOS.
These Methods can work for Windows 8 or higher versions (8.1,10 and 11), Product Key for Windows 7 or lower versions can't be stored in the BIOS, the Key will be Printed on your Device.
If you have any question leave it in the comments, I don't promise you will get the absolute answer but I will try to do my best.
Use this (Hex Value) to find your Windows Key:
(010000000000000001000000000000001d000000)
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