How to downgrading Tube NOKIA 5800 with Software and USB cable

Before you do this, use at your own risk!

1. Download and install the requirement program in your PC (i recommend PC with OS Windows XP Service Pack 3)
JAF.1.98.62 (remove the * sign in the link)
This program already equipped with JAF Flasher box, but i recommend you use the newer version that you can get Here

2. Download the requirement software in this site -> Site
(emulator software that can emulate hardware flasher box)

3. Connect your Tube Nokia 5800 with PC using the USB Cable that you got in bundle.

4. Run emulator JAF box,
in step 1, choose Random Pkey Raskal SN
in step 2, choose JAF (main)
Click tab GO (Launched selected Exe)

5. Automatically, program JAF will start running.
choose tab BB5
in section flash setting, check the option what do you want, in this case downgrade in firmware
, so check downgrade option
uncheck normal box
in section operation, click TAB INF and CHK
in section phone mode, click tab ? (question mark)

6. After firmware and your phone mode recognized, click tab FLASH in section operation to do flashing

7. Wait till flashing process done, then you already success do flashing in your Tube Nokia 5800