Very old hardware revisions may occasionally struggle with the transition from IOS 12.x to 15.x. If the upgrade fails, you may need to perform a "boot loader" recovery via the console using Xmodem or a USB stick . If you'd like, I can: Provide the MD5 hash for file verification.
: Search for "Cisco IOS" and then navigate to the specific IOS version you need (in this case, c2960s-universalk9-tar.152-2.e9.tar ). c2960s-universalk9-tar.152-2.e9.tar
Optimizing Network Reliability: A Step-by-Step Upgrade Path for Cisco 2960-S Stacked Environments using 15.2(2)E9. Very old hardware revisions may occasionally struggle with