Try rebooting the switch with the different image:
1. Reboot the switch by unplugging the power and plugging it back.
2. Press and hold the spacebar button while the switch is booting up.
3. If you enter into the BOOTSTRAP mode then:
a. It will take you to the BOOTROM interface.
b. Select the image that is currently not used type the command "boot 1" or "boot 2"
If the above steps prove unsuccessful, please contact Extreme Networks GTAC for troubleshooting.How to contact Extreme Networks Global Technical Assistance Center (GTAC)