As this is quite an old post I would suggest creating a new post for your issue. include what version you are upgrading from and what version you are upgrading to. Also go to expert mode and navigate to /ngfw/var/log/sf/ find the directory for the software version you are upgrading to and CD into it, then do a tail -f status.log or just less status.log and see if there are any notable errors.
But a couple of things, is the "system is coming up" seen when connected to the console port or on an SSH session? If it is seen on the SSH session, try connecting to the console port and note what output you are seeing there.
If you are able to access the console issue the commands I posted above:
expert
pmtool status | grep -i gui
Check if there are any partitions are full:
sudo df -Th
It might be that the FTD needs a reboot, but before pulling the power on the device I suggest opening a TAC case and have them verify.
Tag me in the new post you create and we can continue this discussion there.
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