The string you've provided, c3750e-universalk9-mz.150-2.se11.bin , appears to be a specific software image filename for a Cisco IOS device, likely a Cisco 3750E series switch. Let's break down the components of this filename to understand what it represents:
This image is for the 3750-E (Enterprise) model. It is generally not compatible with standard 3750 or 3750-G models unless specified by Cisco's Software Advisor. c3750e-universalk9-mz.150-2.se11.bin
Switch(config)# boot system flash:/c3750e-universalk9-mz.150-2.se11.bin : If the switch fails to boot, you can access the The string you've provided, c3750e-universalk9-mz
If you are moving from a very old 12.2(xx) release, check the Release Notes for Catalyst 3750-E to ensure there are no intermediate bootloader requirements. The string you've provided