stop your current node (running 2 nodes with the same keys will cause issues)
backup your node wallet (massa/massa-node/staking_wallets) folder
install your new node from scratch following https://docs.massa.net/docs/node/install => incorporate the fact that you need to put back the staking_wallets folder before launching the updated node, and you don't need to do the client steps
if the rolls are sold due to the downtime, just wait 3 hours to get reimbursed and buy them again with the client
Add a "How to update your node" section with: