SIMPLE GUIDE TO FLASH CWM RECOVERY TO YOUR PHONE IN 10 EASY STEPS
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it simple, let me create a zip file containing all the files you need to flash CWM using ADB.
i've attached it to the forum itself. just a tiny file.

lets begin now...
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1) unzip the adb.zip that i am sending you to the root of drive c:

2) it will have a folder "c:\adb" with the contents of the zip file

3) open start menu > run > type in "cmd"

4) it will appear as c:\users\yourusername

5) type in "cd.." and enter, twice

6) now you should be in c:\>

7) type in cd adb and you should be in c:\adb>

8) make sure usb debugging is ticked on your phone and connect it to the pc

9) you can either just flash the CWM recovery by just using Step B, or backup your original recovery first using Step A and then flash the CWM recovery using Step B

9) remember to type in each line and hit enter before you get to the next command
A) to backup your original samsung recovery to your sdcard with the name originalrecovery.img

adb shell
$su
#dd if=/dev/block/mmcblk0p13 of=/sdcard/originalrecovery.img
B) to flash a custom recovery with the name custom_recovery.img

adb shell
$su
#dd if=/sdcard/custom_recovery.img of=/dev/block/mmcblk0p13
C) PROFIT !!!
notes
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* make sure it is in fact recovery that you are flashing to mmblk0p13, don't flash anything else

* recovery images are usually in .img format, don't try to flash a .zip file. extract it first to get the .img file

* backing up your original recovery is only an optional step