I have the same issue running under Windows 7. I uninstalled the new software 1.40 which tried to install firmware 48. I then installed version 1.312 and ran C:\Program Files (x86)\Tt eSPORTS\POSEIDON Z RGB\FwChack. This installed firmware 40 again. After rebooting a couple of times, forcing 40 onto the keyboard by running the app till it showed that 40 was installed and having an extra keyboard handy I was able to get firmware 40 up and running again. I now have it working and I'm currently using it again but this firmware process has given me a very bad experience. I originally installed it with the thought that it might help the issue where the keyboard enters keys that I'm not pressing but I think that issue is really a hardware issue. Like the feel and the keyboard but these issues are causing me problems.