I have a chiness brand phone, it was running Jelly Bean 4.1 version perfectly. I updated ROM manually to 4.2. Now the problem is I cannot go to recovery mode. THe phone is rooted. I have tried to reboot to recovery mode via ROM Manager and also by pressing Vol Up+Power button. But after restart screen goes blank for few minutes then mobile is restarted again into Jelly Bean.
How Can I recover or reinstall CWM?