do this step
make sure when you upgrade, upgrade to the next release, ie do not jump release
Steps :-
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Take the backup of database
Take the back of alfinstall dir
Now there is a dir named "alf_data" , copy it to a safe place
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Install the next release, give the DB parameters correctly
give the admin the same password as your old instance
when it ask for whether to start the service, do not start the service
Now you replace the new "alf_data" dir with new the previously copied "alf_data"
Cross check your 'alfresco-global.proerties"
start the instance, your upgradation is over
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thanks
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