I would like to upgrade my
What is the proper way of executing a runtime upgrade on a
RPC method to call?
Should this be applied to
collators or rpc-nodes?
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The flow of upgrading the runtime in a parachain can definitely be different from the the flow one can be used to when running a solo chain.
For this scenario what is recommended is following the authorize --> enact path.
Note that the relay chain needs to be informed of the runtime upgrade before it happens, and just after that you could enact the upgrade in your para.
Cumulus provides these functionality in through pallet
Please, find more details on this how to guide