Siemens ESM - Manual (Page 80)

Firmware Update
Industrial Ethernet OSM/ESM
76 C79000-Z8976-C068-10
6. In the Hyperterminal window select Transfer -> Send File.
7. In the next dialog window, enter the file to be downloaded and select
"Xmodem" as the protocol. Start the transfer of the firmware with the "Send"
button.
The following dialog then appears displaying the progress of the download.