There's no need to make the phone S-OFF (like some people say).
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Disable fast/quick reboot (Settings » Power » Fastboot)
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Download fastboot binary
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Unlock bootloader: http://htcdev.com
Put the phone is Fastboot USB mode (Turn off, hold Volume Down + Power)
fastboot oem get_identifier_token fastboot flash unlocktoken Unlock_code.bin (file from email)
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Install ClockWorkMod recovery
fastboot flash recovery cwm-4.0.1.4-saga.img (http://downloads.unrevoked.com/recoveries/cwm-4.0.1.4-saga.img)
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Make a backup
Start clockworkmod recovery (instructions below) Select backup and restore Select backup
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Root
Copy http://tinyurl.com/63tsg9c to sdcard root Start clockworkmod recovery Select "install zip from sdcard" Then select "Choose zip from sdcard" Then select "su-3.0-efgh-signed.zip" Then select "Yes - install su-3.0-efgh-signed.zip" to confirm Then reboot.
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Extract boot.img from the rom zip with Cyanogenmod ROM
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Flash new ROM
Reboot to Recovery, wipe system, cache and dalvik Flash rom zip: http://wiki.cyanogenmod.com/wiki/HTC_Desire_S:_Full_Update_Guide ("Flashing CyanogenMod -> Method via Recovery" part), BUT DON'T REBOOT AFTER STEP 9! (otherwise youre stuck on the white htc screen)
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Flash boot partition
Power off the phone, reboot into fastboot Connect usb Flash boot.img trough fastboot:
fastboot flash boot boot.img
Reboot
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Done
yes its working by this method . i was working as long time for install this rom . but now its working
thanks soo much .