Programming new key - big fail!

Followed these instructions to program a new G chip key on my 2015 Tundra.

https://www.programautokeys.com/cla...ey-programming-instructions-listing-9327.aspx

After doing it, the new key started the truck, but it immediately shut off. Then it would not restart with either the new or one existing working key that I have. Now it just cranks with either key.

Am I screwed? Need some help here. Can I reprogram with Techstream?

 

False alarm. I was able to fix it and add a new key with Techstream!

 

What was the issue?

 

The master key never unregistered. It just took 3 or 4 tries to get it to start after using the unregistered key. I guess the immobilizer needed to reset itself.

After that I was able to do it the normal way with Techstream. I tried to be lazy and not have to break out the laptop, but it backfired.