CWM also known as clock work mod recovery is available for download for Samsung Galaxy Core 2 GM-G355H android phone. The clock work mod allows the user to do all sorts of modifications such as flashing custom ROMs, custom kernels and so on.
The CWM is available here is to be flashed only with Samsung Galaxy Core 2 and here are its installation instructions:
Install Samsung USB Driver and reboot your PC/Laptop/Netbook
Extract odin and CWM_184.108.40.206_Kanas_#1_by_Cleverior.tar.zip in the same folder
Open Odin v3.09
Reboot phone in Download Mode (press and hold Home + Power + Volume Down buttons)
Connect phone and wait until detected on odin
Add the recovery.tar.md5 file to AP / PDA
Make sure re-partition is NOT ticked
Click the start button, sit back and wait a few minutes
Wait until the flashing process is complete
Make sure you have Samsung USB drivers installed on your computer. Use ODIN to flash this CWM file.