If you have a non-functioning key on your Mac keyboard, chances are that it is simply loose. These keyboards are designed so that loose keys can be fitted back in place. You don't need to know much about computers or electronics to fix a key on your Mac, and you should be able to do it in a short amount of time. And the best part is that it doesn't require many tools.
Bluetooth Keyboard PIN Split from this thread. I am having the same issue; namely, when I try to pair my keyboard (to a Win10 Mobile device) it sees the keyboard (Listing it as a 'Bluetooth 3.0 Keyboard, Input') as available to pair. When I touch on the keyboard to pair and it asks for the pin.
Step 1
Insert the end of your tweezers under the dead key and gently pry up to pop it out of place. Place the key face-down on a table or desk.
Step 2
Use your tweezers to remove the plastic hinge from the bottom side of the key.
Step 3
Fit the hinge in the key compartment, making sure that the clips at the side of the hinge connect securely to the metal tabs on the side of the key compartment.
Fit the key back in the key compartment and gently press down until the key snaps in place. The key should now work without any problems.
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Depending on the product, you can find your serial number:
On the surface of your product.
On a Mac, by choosing About This Mac from the Apple menu.
On an iPhone, iPad, iPod touch, iPod, or Apple Watch, in Settings > General > About.
In the Finder or iTunes, if your product syncs with your computer.
If you don't have your product or it won't turn on
If you have your product's original packaging, you can check the barcode to find the serial number.
You can also find your product's serial number on the original product receipt or invoice.
You can also choose a product below for details about finding the serial number:
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Apple registration numbers and Apple hardware product serial numbers might have the number '0' (zero), but never the letter 'O.'