Paradox Home Alarm System

Hi there Any Paradox installers or users here? I've got a Paradox SP5500 with a MG10LEDH Keypad. Had to reset to factory default from the board as I had forgot user code, remote was not working for some reason and didn't know the installer code or master code. After reset, I programmed a user code, a remote control and all the zones by reading through the manual. But the manual isn't very straight forward and I think I've missed some things. Right now one of the zone is lit up on the keypad which I think means that the zone is open. Plus I can't arm the system with the remote control or the keypad. When I try to, the “Arm” light on the top of the keypad starts flashing and gives a single beep. I took the following steps, did I miss anything? 1. Reset the system again from the board directly