The file c3560-ipservicesk9-mz.150-2.SE11.bin is the final Maintenance Deployment (MD) release of the IP Services feature set for the Cisco Catalyst 3560 series switches. This image provides the most advanced Layer 3 routing capabilities available for this hardware. Core Features of IP Services (15.0(2)SE11)
Once you obtain c3560ipservicesk9mz1502se11.bin, you MUST verify it before flashing. A corrupted file will brick your switch during upgrade. c3560ipservicesk9mz1502se11bin download best
Once you have the legitimate file:
enable
configure terminal