[General Questions and Answers] gilang1kb:
First, I'm a total nubie to Android devices. I'm using Sony Xperia tipo dual (ST21i2, ICS 4.0.4, 11.0.A.1.8). Here's the chronology to my problem.

I tried to root my phone using the steps from the following page:

http://xdaforums.com/showthread.php?t=1886460

Everything ran smooth, the root was successful (I checked it with "Root Checker Pro 1.2.8" and it said I get root access).

So one day I installed "Font Changer 2.1.0" (it needs root access), and it said the BusyBox installed was not compatible. I downloaded "BusyBox Pro 9.6.3" and installed it. Font Changer could run then, though it failed to change the phone's font.

I uninstalled Font Changer and "BusyBox Pro 9.6.3" I just installed. When uninstalling "BusyBox Pro 9.6.3", it asked whether to use "Smart uninstall" or "Normal uninstall". Because I'm no smart in things like this, I chose "Smart uninstall". Uninstall was successful but it said my system is unusable anymore.

I tried using "Backup and reset" feature and selected "Factory data reset". Everything seemed to be reset, my phone is running normal.

Then I tried rooting my phone again using the same file and the same procedure. The command-prompt window said the rooting was successful. I checked it with "Root Checker Pro 1.2.8" and it said I have root access. But there was no SuperSU icon on the app interface like the first-time root. Another problem is that when I installed some apps that need root access, they said that the phone has not been rooted, and when I was installing "BusyBox Pro 9.6.3" it said the 'su binary' is not found (I did "Factory data reset" two more times but obtained the same result).

So, I was thinking of flashing my phone using an "ST21i2_11.0.A.1.8_SI 1264-2819.2 AR_EN_FA_FR.ftf" file and "Flashboot 0.9.9.0" I downloaded from the following page:

http://androxyde.github.com/index.html?1355451208000

I installed "Flashboot 0.9.9.0", but there seems to be a problem with the language GUI. Please see the screenshot below:

(I checked the file "config.properties" in the "C:\Flashtool" directory, and the language option is "en", which means English. The language file "en.properties" also exists in the "C:\Flashtool\x10flasher_lib\langs" directory.)

So I used my experience with user interface and tried doing the flashing. But here is the flashing log:

14/015/2012 07:15:17 - INFO - <- This level is successfully initialized
14/015/2012 07:15:17 - INFO - Flashtool Version 0.9.9.0 built on 2012-11-13 22:53:30
14/015/2012 07:15:17 - INFO - You can drag and drop ftf files here to start flashing them
14/015/2012 07:15:29 - INFO - Device disconnected
14/019/2012 07:19:24 - INFO - Device connected with USB debugging on
14/019/2012 07:19:29 - INFO - Connected device : ST21
14/019/2012 07:19:29 - INFO - Installed version of busybox : N/A
14/019/2012 07:19:29 - INFO - Android version : 4.0.4 / kernel version : /system/bin/sh: /data/local/tmp/busybox1: cannot execute - Permission denied / Build number : 11.0.A.1.8
14/019/2012 07:19:29 - INFO - Phone in recovery mode
14/019/2012 07:19:29 - INFO - Root Access Allowed
14/019/2012 07:19:45 - INFO - Selected ST21i2_11.0.A.1.8_SI 1264-2819.2 AR_EN_FA_FR.ftf
14/019/2012 07:19:45 - INFO - Preparing files for flashing
14/020/2012 07:20:22 - INFO - Please connect your device into flashmode.
14/020/2012 07:20:50 - INFO - Device disconnected
14/020/2012 07:20:59 - INFO - Device connected with USB debugging off
14/020/2012 07:20:59 - INFO - For 2011 devices line, be sure you are not in MTP mode
14/021/2012 07:21:06 - INFO - Device disconnected
14/021/2012 07:21:10 - INFO - Opening device for R/W
14/021/2012 07:21:11 - INFO - Start Flashing
14/021/2012 07:21:11 - INFO - Processing loader
14/021/2012 07:21:11 - INFO - Checking header
14/021/2012 07:21:11 - INFO - Ending flash session
14/021/2012 07:21:11 - ERROR -
14/021/2012 07:21:11 - ERROR - Error flashing. Aborted
14/021/2012 07:21:13 - ERROR - Drivers need to be installed for connected device.
14/021/2012 07:21:13 - ERROR - You can find them in the drivers folder of Flashtool.

I have installed the "flashtool-drivers.exe" in the "C:\Flashtool\drivers" directory. So here I concluded that Xperia tipo dual might not be supported yet (is it true?).

But there is another problem I need to ask. When I connected the phone into flashmode (phone turned off, pressing "VolumeDown" key as the phone is connected to PC, the LED becomes green), there was a new-device-connected notification on the taskbar and a notification bubble that said "SEMC Flash Device". But at that very moment my PC was not responding and I had to perform forced shut-down.

I also tried unlocking my phone's bootloader using the instructions on this page:

http://unlockbootloader.sonymobile.com/

but the same thing occured (non-responding PC) when I connected the powered-off phone while pressing "VolumedDown" key to enter flashmode. (I use an old PC running Windows XP SP3, Pentium IV 2.13 GHz, 1GB RAM. Does it affect?)

The main question is: how can I flash my Sony Xperia tipo dual?

Any comments, feedbacks, and solutions are greatly appreciated. I'm a nubie here, so please correct me if I said anything wrong. Thanks.

(Forgive my English, I'm a non-native speaker)