Upgrade firmware on a EM4800 series meter from V1.46

Issue
A user would like to upgrade firmware on an EM4800 series meter with firmware revision V1.46

Product Line
EM4800 series meter

Environment
Firmware upgrade

Resolution
The new version, V1.53 has been reworked in such a way that it is not possible to upgrade from V1.46 to V1.53 in the field since the firmware upgrade will wipe out the calibration coefficients

If a user would like to get the firmware upgraded, the meters would have to be shipped to the factory for recalibration.

NOTE: There are no substantial functional changes between V1.46 and V1.53. Most of the changes have been made to the firmware construction format.