Solution for Pairing A1016 Keyboard with OS X Ventura- Homebrew BlueUtil
It took literally hours to figure this out. Generally, those instructions listed in the Ask the Community are correct BUT unclear when it comes to entering the pairing instruction in OS X Terminal. I'll skip over the blueutil installation instructions. I obtained the keyboard address by pairing A1016 and looking it up under the "About this Mac" tab. It may come up by entering blueutil --paired instruction in OS X Terminal if your computer recognizes it. It will something like 00-0a-95-xx-xx-xx. The pairing instruction will look something like blueutil --pair 00-0a-95-xx-xx-xx. Making sure the Bluetooh GUI is up and your keyboard is listed in the Nearby Devices. You're going to use an USB keyboard or laptop keyboard. Make sure the A1016 green light flashes. After pressing enter for the pairing instruction, you are going to enter 0000 on THE A1016. Repeat every 8 seconds until you see a response in Terminal Expect to see error codes. Expect to do this over and over. It took me about 20 tries. (Another poster said it took 50 attempts). Finally, you'll see a terminal instruction to enter the pin code (0000) on the A1016. Then A1016 will show as a connected wireless keyboard in the Bluetooth GUI. This will be all about trial and error for. I finally connected the A1016 to my MacBook Pro running Monterey and my iMac running Ventura.
Have patience. Eventually it will work. Good luck!
iMac, OS X 10.10