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How to do a runtime upgrade

You need to poses the sudo keys for the chain
Make sure the runtime spec_version is incremented
You need to compile the newest chain. A cargo clean before that would be advisable.

cargo clean

cargo build --release

You need to call the sudo.sudo(call) on system.setCode(code) extrinsic with the sudo keys

sudo.sudo(system.setCode(your_chain.compact.compressed.wasm))

As the "code" argument you need to upload the g6_solo_runtime.compact.compressed.wasm from the target folder target/release/wbuild/g6-solo-runtime/

To confirm the upgrade was successful you should see the new spec_version in the PJS UI top left

Eg. before: g6-solo-chain/102. After g6-solo-chain/103

More info

https://docs.polkadot.com/develop/parachains/maintenance/runtime-upgrades/