If your switch is running IOS 12.2(55)SE or an early 15.0 release, moving to c2960s-universalk9-tar.152-2.e9.tar is a significant leap. You will gain:
Upgrading to a newer version like 15.2(2)E9 can sometimes result in a "brick" where the system light blinks briefly and then goes out. Cisco Community Mode Button Recovery: If the switch fails to boot, you can enter mode by holding the button during power-on. Flash Initialization: Once in the bootloader, use flash_init dir flash: to verify if the file was correctly extracted. Manual Boot: c2960s-universalk9-tar.152-2.e9.tar
After the switch reboots, verify the installation. If your switch is running IOS 12