SE11 is from 2018. It contains discovered after that date. The 3560 platform, even with this final image, should never be exposed to the public internet. Use it only for Layer 2 access in a segmented, legacy environment.
Run show version and show flash: – ensure you have at least 15 MB free . The SE11 image weighs in at approximately 12,800,000 bytes (13.1 MB). c3560ipservicesk9mz1502se11bin upd
Fixes for Power over Ethernet handshake issues with modern VoIP phones or APs. Pre-Upgrade Checklist SE11 is from 2018
If archive download-sw fails, use the legacy method: even with this final image