What is the difference between PCD2.M177 firmware version 3.123 and previous versions?

In february 2010 a new firmware version for the systems PCD2.M177 and PCD.Smart.M177 has been introduced into production. The reason for this introduction is that a new type of flash is used on the PCD7.R400 memory modules. This new flash memory is only supported by the new firmware 3.123 (and later versions).