Will I Be Billed for Upgrading the CBH Software Version?

No.

Upgrading the CBH software version is free, but you will be billed for the extra specifications you obtained by changing specifications.

Log in to the CBH console. In the Operation column of the target instance, choose More > Upgrade. Upgrade the software version after confirming the instance upgrade message. For details about how to upgrade the version, see Upgrading a CBH Instance Version.

After the software version is upgraded, restart the instance and change the instance specifications as required. For details, see Changing Specifications of a CBH Instance.