FastBoot recovery failed: partition 'recovery' not support flash My mobile is Lenovo S920 running official Android OS 4.4.2.

I am trying to install cwm recovery through fastboot.  I tried executing the command 

fastboot flash recovery recovery.img


But I am getting the error as partition 'recovery' not support flash. Please any one help me to fix this. Whether I need to change anything on the recovery partition?
Looks like this phone does not support flashing partitions via the fastboot utility.  According to this guide you will first need to root the phone by following the instructions from here:


  
  Download the latest version of Framaroot and side-load the APK.
  Open Framaroot select the action to perform. Select “Install SuperSU”.
  In the rooting menu, Select an exploit in list above to potentially root your device as Barahir or BOROMIR and proceed
  further. The rooting has now started and you will be getting an
  awesome success message.
  After the end of the installation process, reboot your device and you can now enjoy the Rooted Lenovo s920.
  


After the phone is rooted, you will need to do the following:


  
  Download CWM For Lenovo S920 and extract it to the root of your SD Card.
  Install Mobile Uncle App from Google Play Store.
  Once installed, launch it from your app drawer.
  Select “Recovery Update” from the menu. The tool will search your SDcard automatically and find your “recovery.img” file. Select the
  recovery under “Recovery file in SDCard”. Click “OK”
  It will ask you if you want to reboot into recovery. Click Ok to confirm that your phone boots in CWM recovery.
  If installing Recovery.img doesn’t work on First Time, no problem, after reboot install it again through same procedure.
  


This installs the recovery temporarily.  If you wish to install it permanently, also do the following: 


  
  Install Root Explorer and run it.
  Mount the system partition to Read/Write.
  Navigate to /system/ and delete the file named "recovery-from-boot.p".
  Re-install CWM as described above.