Tmanning2846

Hello everyone, I have a 08 Silverado that has the info button on the side of the dash. I can use this to go to relearn key. It instructs me to use the check to enter but it does not activate. All it will do is blink and then say the same thing. I’ve tried time and time again and nothing has work. I also had someone mechanically inclined use a scanner to hock up to it and they couldn’t get into the code to clear the remotes. All help needed thank you all so much!