If you can't recover from this state, there is no TFTP recovery option on this model and you would have to use TTL to recover.
When you tried the failsafe mode, you were using an Ethernet cable plugged into LAN1?
If you can't recover from this state, there is no TFTP recovery option on this model and you would have to use TTL to recover.
When you tried the failsafe mode, you were using an Ethernet cable plugged into LAN1?