1.Now the FD11XX OLT upgrade is very easy,can you use below command upgrade the OLT:
epon# system update firmware     -----This command is used upgrade the OLT firmware version.
epon# system update web-server  -----This command is used upgrade the OLT WEB firmware version.

Note£º
1.Before upgrade need close the PC firewall,because the PC firewall will kill the TFTP software.

2.The detail upgrade method,you can see the OLT "Configuration Guide.doc"  "#3.Upgrade OLT".
The document you can download from the "C-Data Products User Manual" directory.