I was almost going to agree with Ben on his statement. I still currently have this problem with my LLY. But flashing with v7 works flawlessly everytime. And the AL5 controller will flash no other way except v7. V8 or BBX has NEVER worked with the AL5 in my truck. And V8 is hit or miss with customer trucks with LLYs and LB7s. So I've just gotten in the habit of using v7 for LLY, LB7, and AL5 controllers. As those are the only ones I have this issue with when trying to use V8 or BBX, but have never had a single issue with using v7.