MS Windows Mobile 6.5 - How to return default lock screen

To return default lock screen in MS Windows Mobile 6.5 in some cooked ROM (NRG, TAEL and other), you should remove these registry keys :

[HKEY_LOCAL_MACHINE\Security\Shell\Lock]
"CustomLockScreensMask"=dword:00000013
"CustomLockScreensPath"="\\Windows\\LockScreen"