SYSTEM 800xA 5.1 INSTALLATION

Hi all,
please I need help on sytem800xA 5.1 installation guidelines, we have a existing system 800xA with three operator workstation, one engineering and one mobile so one of the operator workstation the CPU crashed and we want to installed it on a new a computer,pls any helps how to start. thanks
 
Thanks for the quick responses, we don't have a backup of OW so we are going for a new installation using this guide manual, I will revert soonest.
 
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