FortiSwitch: secure, simple and scalable Ethernet solutions
Article Id 194584
In some rare scenarios, if FortiSwitch upgrade fails via GUI and CLI, upgrade the via boot sequence is possible.

This article describes how to upgrade a FortiSwitch via the boot sequence.

1) Plug in the console cable to the Fortiswitch and access it using baud rate of 115200.
2) Download the latest/required image for the Fortiswitch in local PC, the image name will be like :FSW_124E_POE-v6-build0176-FORTINET.out.
3) Setup a TFTP server in the local PC with server/PC IP as Connect this PC to Ethernet port of the FortiSwitch.
4) Interrupt the boot sequence of the Fortiswitch and configure the required TFTP parameters.
Upgrade via boot sequence:

AIFL-ACCESS-SW2 # execute reboot                                     This operation will reboot the system !                               Do you want to continue? (y/n)y
System is rebooting...
FortiSwitch-124E-POE (11:27-11.14.2017)                               BIOS version : 04000006                                         Serial number: S124EP5918007585
Please wait for OS to boot, or press any key to display configuration menu...  1
[G]:  Get firmware image from TFTP server.
[F]:  Format boot device.
[I]:  Configuration and Information.
[U]:  Upgrade BIOS image.
[R]:  Reboot FortiSwitch.
[Q]:  Quit menu and continue to boot.
[H]:  Display this list of options.
Enter G,F,I,U,R,Q,or H: G
Enter network port [port1]:                             
Enter TFTP server address []:
Enter local address []:
Enter local netmask []:
Enter default gateway []:
Enter firmware image file name [image.out]: FSW_124E_POE-v6-build0176-FORTINET.out
Save as Default/Run without saving:[D/R]? D

Loading [ 19529261, 19529261 ]   Success
Saving to default partition ... 100%
Booting default partition : FortiSwitch-124E-POE v6.2.1,build0176,190620
Booting FortiSwitch.
System is started.

SW# get  system  status
Version: FortiSwitch-124E-POE v6.2.1,build0176,190620 (GA)