I haven't seen that exact issue, but I've heard of similar things happening with tunes and power upgrades.
The blinking light usually means the ECU is seeing something it doesn't like, and it's disabling the sport mode to protect the system.
This can be caused by a hiccup during the flash, or a loose sensor connection from the install.
First, I'd go back and double-check all connections.
If those are all good, then I think it's better to reach out to Evo.
It might be something simple in the tune they need to tweak for your specific ECU.
Don't keep driving it hard until you figure it out!