Installing Firmware from Booting Using USB drive

Actually I have  Fortigate 50 E firewall and I formatted by mistake the firmware within booting and now I have no firmware for that reason is there any way the do copying new firmware [FWF_50E-v6-build1263-FORTINET] from USB drive because I tried below solutions:

* Connected Laptop directly to all firewall ports and it's not showing from laptop side it is plugged in.

* Connected to internet modem with set up local IP, TFTP server, subnet mask and gateway of internet router but It showing pinging to gateway is alive but to laptop not is alive while I'm scanning range of IP address and all IPs is showing expected the firewall.

* I connected firewall, Internet modem and laptop to same switch but only showing internet modem alive expected laptop while the laptop can see the internet modem and all of them in same vlan.

For that reason is there possibility to copy firmware using usb drive?