Install CWM recovery for Galaxy Gio

First, you need Odin Multi Downloader v4.42 that you can download here
After downloaded it, you extract to a directory that you wanna.
And, Operate Odin Multi Downloader, then get Gio OPS v1.0 into Select OPS column,
Then, check list one package on left side.
And, Get CWM recovery file into one package column that you can download download here
Click start. Wait till "pass" appears.

Or update zip method.
You can download here for material.
Go to recovery mode (Home+power button, while your phone's off)
Install zip from sdcard.
And choose file u've downloaded

And here, for everyone who wanna go back to original recovery GB a.k.a xrecovery
Link : here

Do same steps like you install cwm recovery by update zip