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DeltaV Smart Switch Configuration using Hyper terminal

Hello Experts

I am able to connect to FP20 8 port DeltaV smart switch using a hyper terminal connection. I am able to connect and log in until I see FP20> prompt. The switch responds to key board strokes. However, when I recycle the power to get into boot menu, It freezes and does not give me prompt to go into menu by clicking 1. I am following procedure as per KBA AK-1000-0014. Usually, the boot menu prompt shows up in 20 seconds for RM100 switches.

I want to upgrade OS to 4.2.14 version as per article.  I  have tried both commissioned and uncommissioned switches (not connected to Network) without success.

Has anyone run into this situation? I would appreciate your advice to resolve this issue

Thanks

Jaimin