Subject RE: [firebird-support] Upgrade Firebird 1.5.3 to 2.5.4 - Using 2.5.4 FB Client to access a 1.5.3 DB database
Author Neil Pickles

Hi Mike,


I don’t have direct experience of using FB Client v2.5 to access v1.5 databases but my understanding is that it should work okay for you. We certainly access v2.1 databases with the v2.5 client okay and accessed v1.5 databases with the v2.1 client without issue.


From what I have read and experienced the clients are backwards compatible but you have to be careful accessing a newer database with an older client which doesn’t usually end well.


I believe you would need to uninstall the v1.5 client first, then reinstall the v2.5 one.




Neil Pickles - neil@...

Greetings All,

We are installing a new Windows 2012 R2 64 bit server at the office and eventually will restore a Firebird 1.5.3 Database to 2.5.4

On one windows 7 64 bit client I will install the 2.5.4 firebird client.

A few questions:

1)      Do I need to uninstall the 1.5.3 client first?

2)      After the 2.5.4 client is install and I’m able to access the new 2012 server successfully, can this same firebird client be used to connect to the old firebird 1.5.3 database on the 2003 windows server?