Below are detailed steps to upgrade from stock firmware to the latest PR 1.1:

1. Download Navifirm (google is your best resource) and flasher 3.12 for harmattan.
2. Once you have downloaded these two files run Navifirm an scroll down and select Nokia N9.
3. Once the model has been selected the tab besides shows the current versions that are available. Select the 20.2011.40-4 update.
4. the third tab then gets highlighted which lists all the models region wise that can be updated.
5. To get your region code pop out the SIM tray and get the six digit code from the sticker.
6. Select the same region code in navifirm and the color and storage capacity of your phone. ( it is very important that you select only the firmware that corresponds with your phone).
7. Once you have selected the firmware download the files associated with it. Size may vary as some fimwares also have games included with them so don't panic if your image size is more than 01GB.
8. Once the download has completed install the flasher software on your computer. Once the installation has fineshed the software will create a path on you computer ( usually the C: but can be different depending on your selection).
9. Navigate to the folder where flasher has been installed and copy the downloaded navifirm image to the same folder.
10. Open CMD and navigate to the folder using the CD command ( cd nokia...cd flasher...)
11. Once the folder of your flasher and firmware run the following command : flasher -F xxxxxxxx.bin -f - where xxxxxxxx is the name of your image file ou have downloaded from Navifirm.
12. after this the flasher will run the command and the will be waiting for device.
13. Switch off your device and after it completely off connect the device to the computer..
14. the device will start to boot and the option to use mass storage or sync will show up on your device..
15. Select the sync option and give it some time highlight it ( it does take some time as the boot process is still running in the background)..
15. the flasher should start running now and update your device.. ( if not you need to disconnect and switch off your device and connect it again.. i did this three times till flasher could recognize my device)
16. Once the process is completed wait for sometime and you will notice the white light flashing on the phone.
17. Keep the phone connected to the computer for 2 to 5 minutes and then disconnect it.
18. the phone will boot and you will be on PR 1.1..

files used for the same :
NAVIFIRM 0.1
WINFLASHER 3.12
IMAGE USED: DFL61_HARMATTAN_20.2011.40-4_XXXXXXX.BIN
OS: WINDOWS 07 64 BIT
SUCESS: 100%