Ever since I updated my Macbook Pro, the shortcuts on the F1-F12 keys no longer work as they did before.

Ever since I updated my Macbook Pro, the shortcuts on the F1-F12 keys no longer work. I used to press just the F12 key and I would be able to raise the volume, now it switches to the home page. I want the old shortcuts back and I don't know how to do that. Please help.

Ever since I updated my Macbook Pro
updated from what to what?
Suggest you try a NVRAM / PRAM reset, as described by Apple:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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