I'm installing a cics sw7.1. In the middle of programming the system locks up and starts flashing on all phones like on start up, called vendor shipped out new software card. Does it again, in middle of programming freezes up and then says cancelled. I shut power off reseated both ampthenol connectors and id cartridge. I can't get the flasing to stop on all phones to allow programming, it just keeps flashing. I installed same unit at another office, both purchased thru same vendor. They are refurbished models. Any suggestion. I do have 2 door intercoms attached to it also. Thanks