How to Install android 2.2 froyo in Nexus one

Google has already rolled out android 2.2 Froyo updates for Nexus one users as an OTA update, but as we know OTA updates are random, so you may not receive the update. But you can always install it manually; just follow the following simple steps :

1. Firstly download Android 2.2 Froyo from one of the following links :
http://www.romraid.com/paul/nexusone/update-nexusone-FRF50-signed.zip (ROMraid / CoBlitz) MD5: 946229291ed8e24cd80aeb4a66ca2fc7

2. Rename the file as update.zip .

3. Hold the trackball & press power button once to boot your device ( in recovery mode ).

4. Select Bootloader –> Recovery  .

5. Wait for the device to reboot. ( you will see a sign of a triangle with an exclamation mark in the centre ) .

6. Now press the power & volume up button ( at the same time ) .

7. Now select apply sdcard:update.zip

Now you are done. Your Nexus one is now updated with the all new Android Froyo 2.2; keep enjoying it..