You are going to need a console cable, a serial port on your PC, and a terminal application.
It is all explained in Summit 200 Series Switch Installation and User Guide:
Accessing the BootROM menu
Interaction with the BootROM menu is only required under special
circumstances, and should be done only under the direction of Extreme
Networks Customer Support. The necessity of using these functions
implies a non-standard problem which requires the assistance of
Extreme Networks Customer Support.
To access the BootROM menu, follow these steps:
- Attach a serial cable to the console port of the switch.
Attach the other end of the serial cable to a properly configured
terminal or terminal emulator, power cycle the switch while
depressing the spacebar on the keyboard of the terminal.
As soon as you see the
BootROM-> prompt, release the spacebar. You
can see a simple help menu by pressing
h. Options in the menu
— Selecting the image to boot from
— Booting to factory default configuration
For example, to change the image that the switch boots from in flash
1 for the image stored in primary or
2 for the image
stored in secondary. Then, press the
f key to boot from newly
selected on-board flash memory.
To boot to factory default configuration, press the
d key for
default and the
f key to boot from the configured on-board flash.