Yesterday, I went ahead and tried 5.5 out. It took a while the first boot, but after booting I was able to map my ps4 controller. I restarted the device with the controller still plugged in and it booted pretty fast, but it slowly transitioned from the Logo screen to emulation station like it was struggling. From there I found I had no sound. I even tried to restart a few more times and found the same thing. Maybe audio is being forced from ps4's audio jack?
When I booted with no controller, it took 5 minutes at the logo screen, then screen went black.
Controller plugged in and it boots under 30 seconds.
No controller plugged in it takes over 5 minutes and sometimes doesn't boot.
Maybe its continuously looking for a controller, but not timing out after say 15 seconds?