OK - the LCD display issue is
K03310534: The LCD on BIG-IP iSeries platforms may become unresponsive following a system restart
You will need to request an EHF to resolve that.
Maybe the 16.x partition has only default config (IP address 192.168.1.245), or does not have a license.
Did you reactivate the license before the upgrade attempt, and transfer the config?
As for recovery, I'd recommend getting a physical console (serial) cable on to the device, and use that to reboot back into the 14.x partition via grub.
If you want to upgrade to 16.x, I'd recommend deleting the existing 16.x volume, and re-doing the upgrade to ensure that the current config is applied to the 16.x volume (with a recently reactivated license).