ERROR: Write memory is not permitted when switch is running in certified mode

Problem on 6900 switches "Write memory is not permitted "

OS6465 Auto VFL

Working/Certified Directory in R6/R8
An OmniSwitch in Release 6 provides the user with the ability to keep two separate configurations as well as two separate versions of AOS stored on the switch. These are stored in the WORKING and CERTIFIED directories. The switch can boot from either configuration. The AOS files are the *.img files and the configurations are the boot.cfg files. When a switch boots the RUNNING CONFIGURATION will come from either the certified or working.

Alcatel switches can operate in two modes: working and certified ( show running-directory   to know in which mode the switch is).  In ...

OmniSwitch 6465
Hardware Users Guide

OmniSwitch AOS Release 8
Switch Management Guide
v8.8R2

Quick Steps for Configuring IP Forwarding:
Alcatel Lucent ALE Omniswitch