Hello Bikash,
Well, yes you are right! if you get any seat in josaa counselling and it gets upgraded then then you can't degrade it in subsequent rounds, as is stated before the submission of Willingness Document while registering in josaa... however you have the choice of withdrawing the seat and you can participate in CSAB (spot round) with no restriction....
Hope this helps, and feel free to ask any further query...
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