If your device is s-off, you can use SDK and fast boot to manually flash the recovery. You would first boot into boot loader and enable fast boot. Then you would plug the phone into your computer, move the recovery.img, as well as fastboot.exe, adb.exe and its two counterparts from the sdk into a folder titled adb_win in your computer directory ( C: ). You would need to open the command box, you can do so by clicking in the search bar and typing cmd.exe type
cd C:\adb_win
fastboot devices
fastboot devices should show you your serial.
Then type
fastboot flash recovery recovery.img
Give it a few seconds for it to do its thing. When its done, reboot and go to bootloader.
Go to recovery and it should be a custom recovery, or in this case, cwm.
But before you do this, im trying to find if there is any harm to flashing over a previous custom recovery.
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