We are letting you know here the instructions to install CWM after revolutionary. The credit goes to attn1. The person has explained the overall procedure in a very easy way. So, please check the below steps.
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1. You need adb and fastboot. Download them and install as per your operating system like whether you are using Windows or Linux.
2. Download CWM Clockworkmod Recovery img file as per your mobile phone
3. You should be considering moving the img file to the directory/folder/map as fastboot and navigating with terminal (if you are using Linux) and Command Prompt (if you are using Windows).
4. Unplug the Universal Serial Bus
5. Power off your phone.
6. Press Power and Volume Down buttons.
7. You will see that Hboot is starting.
8. Sdcard scan will start.
9. Wait till Sdcard scan completes
10. Plug the Universal Serial Bus
11. Press Power one time.
12. Fastboot USB mode will start and your mobile will be in Fastboot USB Mode.
Commands:
For Linux:
sudo ./fastboot flash recovery recovery_name.img
For Windows using command prompt:
fastboot flash recovery recovery_name.img
Follow below steps now. We advice you to do backup before you install any new ROM or flash any new one.
Doing Backup
13. Unplug the Universal Serial Bus
14. Power off the smartphone
15. Hold Volume Down key for sometime and press Power key.
16. You will see that Hboot starts.
17. With Volume Down key, you should consider navigating to recovery.
18. Enter into Recovery by selecting Power.
19. You will see that CWM starts.
20. You should consider selecting Backup and Restore
21. Now select Backup
Rooting Smartphone
22. Download su-2.3.6.1-ef at http://bit.ly/su2361ef
23. Copy su-2.3.6.1-ef to the root of your SD card.
24. Follow the instructions from Step 13 to Step-19
25. Choose the ‘Install zip from SD card’.
26. Consider selecting su-2.3.6.1-ef-signed.zip file
27. Confirm by selecting ‘yes – install su-2.3.6.1 ef signed.zip’.
28. Go back
29. Reboot your smartphone
30. You have root now 
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Thank you it’s worked
( htc desire cm7.1 )
@alex - wc always
hi.. i m using htc desire hd 2.3.3 with 2.1 sense .. software - 2.37.720.3 CL56018 release-keys i need ur help as i tried everywhere… almost every blog on the net regarding rooting this version of desire hd gingerbread but did not get any solution or answere. 1st is dat possible to root this version?? as i did not see anyone who said yes and if yes then send me that gingerbreak.apk if it needs to root this? i will be very thankful to you . Regards Niks