Hello,I have six switch stack with three other model versions:WS-C2960X-48TS-L 15.2(2)E5WS-C2960X-48FPS-L 15.2(2)E1WS-C2960X-48TS-L 15.2(2)E3WS-C2960X-48TS-L 15.2(2)E3WS-C2960X-48LPS-L 15.2(2)E7What is a way to update all to 15.2E7? I read some topic...