BOOT Upgrade Method
11 series OLT need upgrade the CFE,so it must upgrade in CFE mode.
Please follow the step as below to upgrade 11 series OLT

OLT console port --PC
OLT MGMT----PC(tftp server)  set in the same network segment，and run tftp server

Reboot the OLT to keep the keyboard <Ctrl+C>，Enter the CFE mode.
â‘ config OLT ip address
CFE>ifconfig eth0 -addr=192.168.100.100 -mask=255.255.255.0    
CFE>ifconfig           ------can use this command check the ip address is config success.

â‘¡Upgrade boot file
CFE>flash -noheader 192.168.100.2:FD1104B_CFE_151113.bin flash0.boot

③Upgrade main file （双镜像）
CFE>flash -noheader 192.168.100.2:FD1104B_V2.4.05_180517_X000.img flash0.os
CFE>flash -noheader 192.168.100.2:FD1104B_V2.4.05_180517_X000.img flash0.os2

If failed , please try it 
CFE>setenv -p STARTUP 'sleep 5; boot -elf -z flash0.os:FD1108S_V2.3.05_180517_X101.img'

â‘£Restart the OLT to complete the upgrade
CFE>reset -yes -cpu