Can someone please post arma 2/oa registry entries for 64 bit windows installer for arma 2, which just allowed you to change cd-keys faster. Hai, i just got Arma II: ACR, PMC, and Brits. I know Arma 2 and Arma OA work becasue, i have +30 hrs in both Steam loged and ~50hrs. This small tool allows you to change ArmA 2 CD-Key in registry. In windows registry, cd-key is in HEX format, this tool also converts entered. Arma 2 exited with "Bad serial number given in setup" error after a few seconds after launch. When I opened "regedit", I saw that field "Key" in. If you need CD keys just go to: Sign in to activate Arma 2 Free! 6) Go back to the registry and rename the "ArmA 2 OA" folder (The one that. Today im showing you how to chage Arma 2 OA (DayZ) key through registy. 1. Click on Start Menu, write regedit and press enter. 2. Now navigate to: 64bit. Basic registry for Armed Assault 2. The CDKEY is stored in hex, like this: "KEY"= hex:xx,xx,xx,xx,xx,xx,xx,xx. You will need to convert your CDKEY into this format.