s3 gt-i9300 recovery installation? with odin doesn't work

so, simple, i can't find a goot tutorial on how to flash a recovery, i tried with odin 3.0.4 and i've flashed twpr 2.8.6.1, cwm 6.0.4.7 and another cwm version, after the flash with odin if i restart the phone i still have the original recovery