recovery not working for Samsung Galaxy ace

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http://forum.xda-developers.com – When i flash the stock rom using odin, the stock recovery works. but then, when i update the CWM to any version, the recovery stops working. It stops on the samsung galaxy ace screen which is the 2nd screen, with a small yellow dot on top left. i am not able to flash any rom. i have even tried using d CWM app, but it stops at d same screen. pls help. Note: the download mode and the stock rom works perfectly. (HowTos)