I've created a new BYOL ASAv on AWS using an m4 machine type and it's having problems starting.
It performs the initial boot, platform type detection etc, then restarts. However, it then hangs on the screen below. It's been like it for about 20 minutes so far. I have two different AWS accounts (completely different organisations) and it's having the same problem on each one.
Have you provisioned the correct number of interfaces?
Also confirm you have the correct machine type on AWS with ASAv compatibility table below:
The instance was created by AWS Marketplace, using the defaults of the Cisco template.
It uses a c4.large machine - one of the approved types - which only supports 2 network interfaces.
But it doesn't even get as far as detecting interfaces. It hangs after the 'Booting the kernel' message.
Unfortunately you can't rely on the EC2 console output. Have you looked at the instance state to see if it's running and that the Status Checks show 2/2? It can take several minutes to get the ASAv running so that you can connect to it via SSH.