There is a command group 'az_iot_du_device_class'. This group of commands could 'device class and device class subgroup management'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_iot_du_device_class_update'.The syntax is: az iot du device class update --account
                              --cid
                              --instance
                              [--friendly-name]
                              [--resource-group]. The 1th example of the child command would be to use it to 'update the device class friendly name', the syntax is: az iot du device class update -n {account_name} -i {instance_name} --class-id {device_class_id} --friendly-name "EU-region". The parameter '--account -n' is required. It is used to device update account name. you can configure the default account name using `az config set defaults.adu_account=<name>`.. The parameter '--cid --class-id' is required. It is used to device class id. this is generated from the model id and the compat properties reported by the device update agent in the device update pnp interface in iot hub. it is a hex-encoded sha1 hash.. The parameter '--instance -i' is required. It is used to device update instance name. you can configure the default instance name using `az config set defaults.adu_instance=<name>`.. The parameter '--friendly-name' is optional. the device class friendly name. the friendly name must be 1 - 100 characters and supports alphanumeric, dot and dash values.. The parameter '--resource-group -g' is optional. device update account resource group name. you can configure the default group using `az config set defaults.adu_group=<name>`.. 