Please upgrade in CLI:

1.upgrade FD1108S_V2.4.06_190829_X000.img file and then reboot

2.upgrade FD1108S_V2.4.06_190829_X000.img file again but don't reboot olt

3.upgrade FD1108S_FW_V2.4.06_190829_2302_X000.img file then reboot