Thank-you indeed for the response.
My apologies for the delay in response due to an medical emergency.
Anyways, whilst thanking you, have already instructed our team to take this forward.
Shall keep you posted on the development.
Meanwhile, Fortinet should come out with a solution for this as any trade-up or tech refresh will always call for latest equipment with latest firmware, hence Fortinet should work on a solution for smooth migration for moving of Config, logs etc seamlessly from one box to the other.
Just a thought.
Thank you once again for the support.