hey guys.. i'm running into the same issue Hyper-V setup, running hyper-v 2012 server core, i have an additional "waiting 2 seconds for synology manufactory device" after all those messages...same issue.
I also have my updates turned off.. mine was running fine till one day the volume got issues and I click on the repair- and Synology ask me to reboot and after reboot it never came back
Hyper-V 2012 setup
Running 5.2 5565.2
debug mode and install/upgrade mode - but all same - gets stuck ... can't console, can't ssh, can't ping..its almost as if it doesn't want to get an IP..
Anyone has any solutions for this ?