How to upgrade firmware from v1.1.2.0 to v1.2.2.x Procedure_v1.0

FIRMWARE CHANGES AND ENHANCEMENTS:
Runtime V1.2.2.15, Loader 0.2.1.1
EPR
Headline
1
ECS2100
[enhance] support LACP passive mode
2
ECS2100
[enhance] switching B/W L2 DHCP relay and L3 DHCP relay
3
ECS2100
[enhance] support simple chinese web page, web help page.
Runtime V1.2.2.9, Loader 0.2.1.1
EPR
Headline
1
ECS2100
[enhance] remove ERPS
2
ECS2100
[enhance] support RIP
Runtime V1.2.2.0, Loader 0.2.1.1
EPR
Headline
1
ECS2100
[enhance] support QinQ
2
ECS2100
[enhance] support mDNS
3
ECS2100
[enhance] support Static routing
4
ECS2100
[enhance] Support IP Cluster (Software Stacking)
5
ECS2100
[enhance] support ERPS
6
ECS2100
[enhance] support Web Authentication
7
ECS2100
[enhance] support SFTP