We will use the FlowtyTestNFT contract as an example, you should replace it with your project smart contract

Requirements:

Flow CLI installed into your computer https://developers.flow.com/tools/flow-cli/install
Crescendo Flow CLI installed into your computer https://cadence-lang.org/docs/cadence-migration-guide#install-cadence-10-cli

Open the terminal and run the command: flow accounts create
Enter the account name, for example: testnet-account
Select testnet network
At the end you will see that a new account has been added to your flow.json file

    "testnet": {
      "your-testnet-account-name-here": [ "FlowtyTestNFT" ]
    },

Run the command to deploy the contract on the testnet network using your new testnet account flow project deploy -n=testnet

Inside the flow.json file, update the testnet contract address present inside the contracts > FlowtyTestNFT > aliases > testing object, using the new testnet account address where you deployed you FlowtyTestNFT contract version
- Current alises.testing value: 0000000000000007
- To the new testnet wallet address that you created on previous step
Inside the flow.json file, update the FlowtyTestNFT source, to use the crescendo update FlowtyTestNFT version, to it you will need to replace the:
- Current source: "./contracts/FlowtyTestNFT.cdc"
- To the one using cadence 1.0 contract version: "./contracts-v1/FlowtyTestNFT.cdc"
With the updated paths in the flow.json file you can now run the command that will perform the migration to the updated contract:

flow-c1 migrate stage FlowtyTestNFT --network=testnet

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