1. Boot the switch with firmware version ECS2100_V1.2.2.25 
2. Upload jump code ECS2100_Jump_V1.01.1.24 to the switch
3. Boot the switch with jump code
4. Delete Firmware ECS2100_V1.2.2.25
5. Upload newer firmware ECS2100_V1.2.2.28 or later of the runtime (this sample use ECS2100_V1.2.2.31)
6. Boot the switch with firmware ECS2100_V1.2.2.31
7. Delete Jump code.