To begin with precautions:
1. Make sure your computer is protected from changes nyapryazheniya and power outages.
2. Make sure your phone is charged.
3. Need experience with partitions
4. It may deprive your phone warranty!
5. If something goes wrong, you have every chance to get a corpse.

Let's go:
1. Need N9 64Gb
2. We need a PC with Linux. The virtual machine will not work.
3. loads the "service core." This is described here.
4. Put yourself KDE Partitionmanager. Find it in search of a center applications. On Ubuntu it just is. Why him? Because it works with EXT4-partitions without losing data.
5. Run it in normal possible only through the terminal on behalf of the root:

Code:

sudo partitionmanager

6. click on our phone menus on the left. It will be submitted as a single unit. Not three!
7. In the right half of the window there will be sections of our phone.
8. Alternately, click on our section, right click and select unmount
9. are advised to make backup copies of each section. Well, you never know what might happen. To do this, click on t
he section, then on the menu at the top partition-> backup
10. And then Move / Resize dialog will cause in which we can define the position and size of each section. To build one, you reduce the other.
11. Your every action will not happen for real, until you click APPLY at the top left! On that every action can be undone!
12. If something went wrong, it's better to cancel and redo
13. Done? Click APPLY, check back again what should happen, then click OK
14. if it ended successfully, we obtain from your phone, cable, wait a few seconds, turn on him.
15. With a sinking heart, waiting for the appearance of signs NOKIA
16. We are glad

PS Correct my text if I'm not well-written manual. Sometimes used a translator!