Revenue firmware security features
You cannot perform resets or configure some revenue-specific parameters on your meter while it is revenue-locked.
Revenue meters and firmware upgrades
| Meter model | Upgrade information | 
|---|---|
| PM5561 / PM5661 / PM5761 | The OS CRC value is a number that identifies the uniqueness between different OS firmware versions. You cannot upgrade a locked meter. In order to upgrade, you must: 
 | 
| PM5562 / PM5562MC | You cannot upgrade a locked meter. In order to upgrade, you must: 
 | 
| NOTICE | 
|---|
| LOSS OF COMPLIANCE Ensure that you re-certify your meter with the appropriate
                        revenue metering authorities after re-enabling the hardware-based
                        security. Failure to follow these instructions may render your
                        device non-compliant for billing purposes. |