Allied Telesis AT-S39 - Manual (Page 168)

Section II: Local and Telnet Management
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10. Click on the Protocol field and select as the transfer protocol either
Xmodem or, for a faster download, 1K XModem.
11. Click Send.
The software immediately begins to download onto the switch.
The Xmodem File Send window in Figure 51 displays current
status of the software download. The download process takes a
couple minutes to complete.
Figure 51 XModem File Send Window
If you are installing a new management image, the switch begins
to initialize the software after it is installed, a process that takes
approximately 1 minute to complete. Once the management
software is initialized, the switch automatically resets.
Note
Do not interrupt the initialization process. Do not reboot the switch.