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Nokia-s40-multitask
This trick works only when you disable security wall.

Process :

1-Download JAF on pc.

2-Connect your Phone with pc in PC-Suite Mode.

3-Open JAF and go to BB5 Tab.

4-Tick the following.
a-Read pp.
b-Normal Mode.
c-CRT 308(Already Ticked).

5-Now Click Service.

6-Save the *.pp file on Desktop.

7-Open the *.pp file in Notepad.

8-In case the Phone is-
a-Nokia s40 v3 then Search for 28 1 line and change it to 28 2
b-Nokia s40 v5 or v6 then it will look like this
[Product Profile RM-614_354xxxxxxxxxxxx]
SETS 1
ELEMENTS 2
SET 1
0 31
1 0
Now Edit it, add 48 2 just after SET 1 so it will look like this:
Note: It must be right after SET 1, or else it'll not work.
[Product Profile RM-614_354xxxxxxxxxxxx]
SETS 1
ELEMENTS 2
SET 1
48 2
0 31
1 0

9-Save the *.pp

10-Open JAF>BB5 Tab.

11-Tick the following:
a-Upload pp
b-Normal Modec CRT-308 (Already Ticked)

12-Click on Service.

13-Select the *.pp File.

14-After it shows Done, Select Normal Mode from the Drop DownMenu.

15-Phone will Restart and show Test in RNDIS USB mode? Press NO.This popup will be shown
on every restart this is normal.
Now we have successfully disabled the Nokia Security wall.

Download JAF from Here: http://www.4shared.com/rar/5QWxi_SU/JAF_19864_FULL_CRACK.html

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NOTE: If It Show an Error like "Failed! Aborting!" Then Click 'Service' button First & Then Quickly Connect Your Phone.
Now your done with the hacking, now its timefor the modding:
-Modding the J2ME application to be able to be minimized.
You'll need the following:
1.Winrar - http://www.rarlab.com/
2.JAR of the J2ME application.
Steps:
1.Open the Jar(eg. operamini.jar) with Winrar.
2.In the winrar browser/window, open the META-INF Folder.
3.Inside it, theres a MANIFEST.MF file, just drag/extract it to your desktop. Do not close winrar.
4.Go to your Desktop and Open MANIFEST.MF with Notepad.
5.Add this Nokia-MIDlet-no-exit: true on the end line of the MANIFEST.MF.
Example:
Original MANIFEST.MF:
Manifest-Version: 1.0
MicroEdition-Configuration: CLDC-1.0
MIDlet-Name: Call Cheater Manager
MIDlet-Info-URL: www.eamobile.tk
MIDlet-Icon: /icons/icono.png
MIDlet-Delete-Confirm: visit www.eamobile.tk
MIDlet-Vendor: EAMobile-Xavi
MIDlet-1: Call Cheater Manager, /icons/icono.png, c.c
MIDlet-Version: 1.1
MicroEdition-Profile: MIDP-2.0
Nokia-MIDlet-no-exit: True
Add Nokia-MIDlet-no-exit: true to the last line:
Manifest-Version: 1.0
MicroEdition-Configuration: CLDC-1.0
MIDlet-Name: Call Cheater Manager
MIDlet-Info-URL: www.eamobile.tk
MIDlet-Icon: /icons/icono.png
MIDlet-Delete-Confirm: visit www.eamobile.tk
MIDlet-Vendor: EAMobile-Xavi
MIDlet-1: Call Cheater Manager, /icons/icono.png, c.c
MIDlet-Version: 1.1
MicroEdition-Profile: MIDP-2.0
Nokia-MIDlet-no-exit: True

Now save it.
Then drag the modified MANIFEST.MF in to the Winrar Window, make sure you drag it inside the META-INF Folder. A replace prompt will appear, just click yes.
Now copy your modded jar file to your s40 Phone, do this to all your app and you'll be multi tasking in no time.
Heres the Fun Part!
Once youve installed the modded apps on yourhacked C3. And you want to try the multitasking, all you have to do is open a modded app, then to minimize it, just press the red call button/cancel call button, then you can open another app.. Now to maximize an app, just run the app again and you'll continuewhere you left off on that app.
Enjoy!