SOLVED
Xperia Mini 4.0.2.A.0.58 (ST15i/a) Update
Thanx XDA forum
Firmware TBA
or
4.0.2.A.0.42 (many versions + root)
http://forum.xda-developers.com/showthread.php?t=1321948
http://forum.xda-developers.com/showthread.php?t=1312475
download FlashTool
http://forum.xda-developers.com/showthread.php?t=920746
or
http://androxyde.github.com/Flashtool/
Install it and you will see 5 folders
Custom
Drivers
Firmwares
Loaders
X10Flasher_lib
take the firmware to the "Firmwares" folder
click on Falsh
Press Ok
it will ask you to connect your phone on Flashmode (turn off your phone, press the back button, then connect the USB) press OK
This is an step by step guide
profile.country.GB.title
this is how to add more Internal Memory it's a long process but its worth it
1) backup everything (Check above)
2) backup your SD card
on your PC
1) open any folder -> click on tools -> properties -> view -> show hidden files
2) mount the SD card, go to your SD card, press Ctrl + A then Ctrl C, on your desktop create a new folder, open it, then press CTRL + V
now this is where it gets AWEOME-ER
Guide to using Link2SD on your Xperia smartphone
This guide may seem lengthy, but trust us when we say it is straightforward. All steps have been documented which makes it look daunting. Read each section carefully and follow the steps outlined to install Link2SD.
1. PREPARATION
Please make sure you have completed all of the following before starting the tutorial.
On your PC:
– Install the necessary drivers for your Xperia smartphone onto your PC/laptop. The easiest way to do this is to ensure that Sony Ericsson PC Companion is installed on your PC. Once installed, connect your phone to complete the process.
– Download and install MiniTool Partition Wizard onto your PC or laptop.
On your Xperia:
– Enable USB de-bugging mode: Setting –> Applications –> Development –> Tick ‘USB debugging’
– Enable the ability to install unknown apps: Setting –> Applications –> Tick ‘Unknown sources’
– Install Link2SD from Android Market onto your Xperia smartphone. It is a free download.
2. ROOT
3. BACKUP MEMORY CARD
As we will be creating a partition on your microSD memory card, make sure you create a backup just in case anything goes wrong.
a) Create a new folder on your PC and name it anything you want, such as ‘SD_Backup’
b) Connect your phone to the PC, navigate to your memory card and copy the contents to the backup folder.
4. CREATE SECONDARY PARTITION
You now need to create a secondary partition on your microSD memory card that will enable you to use Link2SD.
Note: We will use MiniTool Partition Wizard to create a secondary partition on your microSD card. This partition can be ext2, ext3, ext4 or FAT32. We will use FAT32 as it is supported on all phones and should lead to less troubleshooting later. You can use any partition manager of your choosing, but the steps below guide you through MiniTool Partition Wizard.
There is no need to wipe your memory card when going through this process, just ensure you have at least 0.5GB to 1.0GB of free space to make it worthwhile. You also do not need to use a microSD card adaptor as the process below creates the partition whilst the phone is connected to your PC.
a) Connect your handset to the PC via USB and then launch MiniTool. You should see the details pop up under ‘Disk 2′.
b) Click on the memory card under Disk 2 in MiniTool and then in the left pane, press ‘Move/Resize Partition’. On the blue bar under ‘Size and Location’, move the right arrow towards the left to create the size of the secondary partition desired. In the example below we created a secondary partition with 1018.63MB of space. This value can also be typed in manually in ‘Unallocate Space After’.
c) Once this is done you should see that your memory card is now split into two partitions under Disk 2 of MiniTool. Right click this new partition and then press ‘Create’.
If you see this pop-up below, just press ‘Yes’ to continue.
d) You should then see this ‘Create New Partition’ window. Under ‘Create As’ click Primary and then under ‘File System’ click FAT32. Leave the cluster size as default and you can assign whichever drive letter you want. Once finished press OK.
e) This should bring you back to the main MiniTool screen. Now hit the ‘Apply’ button on the top-left of the screen, denoted by a tick symbol.
This will bring up another pop-up window and will take several minutes to both resize and create the secondary partition.
If successful, you should see message below. Congratulations your card is ready to use in conjunction with Link2SD.
5. LINK2SD
This application makes it easy for users with root privileges on their phone to move applications to the SD card.
a) Open the Link2SD app on your phone. You should be greeted with the following menu, check the FAT32 option and click OK.
You will then see the Superuser Request, click ‘Allow’.
Once you see the following message, restart your phone. The app should now be ready to use.
b) To make sure everything is installed correctly. Click the Menu button and go to ‘Storage Info’. This will show you the internal memory and your two partitions on the memory card. In our case, you can see that the second partition has 1GB free.
c) Now you need to move the apps of your choice to the memory card. Click the Menu button and press ‘Multi-select’.
Choose which apps you want to move by clicking the tick box next to the app. System apps are greyed out and cannot be selected. Link2SD can only move apps that are already on the internal memory. If you have apps already on your SD card, you will need to move them back to the internal memory before you can link them with Link2SD.
If you want to move all of your apps, pressing the menu button will bring up another menu allowing you to do this.
d) Once you have chosen which apps you want to move, you then need to hit the menu button and press ‘Actions’, which will bring up the following menu. Press ‘Create Link’.
Leave all three check boxes ticked and press OK. Link2SD will now do its work and move/link the selected apps to your memory card.
Once finished, you should see that the apps you have moved have ‘Linked -> SD Card’ in red font in the Link2SD app list. Reboot your phone.
e) Congratulations your phone is now using Link2SD! You should now go to Settings by pressing the menu button and configure how you would like Link2SD to work. The main decision here is whether you want to Auto Link newly installed apps to the memory card. Given that you’ve gone through the hassle of installing Link2SD we suggest you enable Auto Link and make worrying about your internal memory a thing of the past.
Special Thanx to the Xperiablog
http://www.xperiablog.net/2011/12/12/link2sd-guide-never-worry-about-internal-memory-limits-again/
Thank You for this workaround... all was going fine and quick, but rooting my device took me over 12 hours of reading and searching in the web. 
Because i dont wanna brick my brand new device.
But now i know so much more. So many things can be done now with this phone... really cool, i will install and try cyanogen mod 7 this week, and i was starting with your link2sd tip 
Now this like a new Toy for kids, hehe never thougt i can do so much with this device.
Thanks a lot for your guide Mr. uliwooly-wooly
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