:bang: Can't remember, On an Executone IDS, can an ACPU be upgraded from 2.5.1 to 3.0 with a simple chip change or does the program need to be hand loaded to an ACPU with 3.0 on it? :confused:

I believe what you will want to do is get a fresh program backup with the 2.5.1 software installed then default the program, install the 3.0 eproms and then reinstall the program from your current backup onto the new software.

Thanks for your help. A chip change was all I needed to do. Of course a backup was done first.