[Sony Ericsson XPERIA X10 Mini] TheMiltos21:
This is a tutorial for begginers with Stock,un-touched Eclair 2.1 to reach having a custom kernel and/or a custom ROM.You will also find Tools and ROMs (Reference).​

***I am not responsible if something bad happens to your device.You can continue at your own risk.Even though a hard brick is very rare you still continue at your own risk~~!Also if you perform step #18 you lose your warranty (The warranty will be back if you relock your bootloader again,but make sure to flash stock again or your phone becomes permanent brick :))

Rooting : (Needed for Mods,Root applications)​

Step #1 : Download Flashtool and install it from this website : Flashtool 0.6.8.0 and install it.

Step #2 : Download Sony Ericsson Update Service (will be mentioned SEUS) from this website : Sony Ericsson Update Service and install it.

Step #3 : Go to Settings>Applications and tick Allow install from unknown sources.

Step #4 : Go to Settings>Applications>Development and tick usb debugging.

Step #5 : Open Flashtool.

Step #6 : Connect your phone to your Computer via USB Cable without mounting USB storage.

Step #7 : Click on the unlock icon in Flashtool.

Step #8 : If a popup appears saying that it can't identify the device select U20i X10 Mini Pro and click OK.

Step #9 : If a popup appeared as in step #8 another one should pop.It will be saying : Do you want to permananently identify this device as U20i?Click Yes/OK.

Step #10 : If it has finished it will reboot.Normally,in the applications drawer you will find a new application called SuperUser.

ClockWorkMod recovery (Needed for installing Custom ROMs and mods)​

Step #11 : Download ClockWorkMod 3.2 from here.

Step #12 : Extract the .zip file you just downloaded on your desktop/wherever you'd like.

Step #13 : Double-click the file called install(.bat)

Step #14 : Press Enter

Step #15 : Is your device ROOTed? Type y and hit enter.

Step #16 : Do you already have a recovery installed? Type n and hit enter.

Step #17 : Turn off your phone.Turn it back on and when Sony Ericsson white letters apear keep pressing rapidly the back button.If you got into an orange menu then ClockWorkMod has got installed.You can navigate using the Volume keys,select using the home button and go back using the back button.For now navigate to Reboot sytem now and hit the Home button.

Bootloader and kernel install: (Optional,and you do this at your own risk)​

Step #18 : Unlock your bootloader as described here : Unlock Bootloader

Step #19 : Download one of the many ROMs in the X10 Mini Pro Android Development section or try out mine which is MiniCM7 improved : XMP ROM. <== (Requires kernel nAa-11,unlocked bootloader!)

Step #20 : Download a kernel (if you unlocked the bootloader),I personally suggest nAa-11 kernel.Then put it in C:\Flashtool\firmwares.Open Flashtool and click on the lightning icon.Select the kernel (not kernel.sin,kernel meaning ex. nAa-11) and click OK.Remove battery,instert USB cable,keep pressing back button while adding battery till LED green flashes.Wait till it finishes.

How to install ROMs(If you dont unlock bootloader you need roms that dont require,ex. MiniCM7Pro by paul-xxx)​

Step #21 : Put your downloaded ROM (it is a .zip file) into your SDcard.

Step #22 : Reboot into CWM-Recovery (ClockWorkMod) and select backup and restore.then select backup.Yes.

Step #24 : Install custom zip.E.g. MiniCM7 2.1.9 mimmi.zip|

Step #25 : Select yes.

Step #26 : If it doesn't boot you probably have installed a ROM that needs a custom kernel and you are on stock : You need to unlock bootloader/use another one which doesn't require custom kernel e.g. MiniCM7Pro V21.

Step #27 : I hope you enjoy your device.If you damaged your phone (e.g. stucks at Sony Ericsson text) Open Sony Ericsson PC Companion and select repair phone.Select X10 Mini Pro and select update.Now remove the battery of your phone (it just has to be turned off) keep holding the back button and insert USB cable to Computer.Green LED will flash from your phone.Just wait till it finishes.Now your phone will be back at stock.To make it like it was before,follow again until step #17.Now into CWM select backup and restore,restore.Select 2012.03.18.17.50 for example (it says the date/time you created the backup) and it will restore your system before you followed the guide (all your contacs,sms,apps) but with one difference.Your phone will still be ROOTed and it will have CWM installed!

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If your device doesn't respond (stops at kernel logo or triangle) download this ftf file and flash it like a kernel.This doesnt need unlocked bootloader.It is from another "Serres" guy just like me :D , leajian : Stock 2.1.1.A.0.6 ftf firmware by leaijan

http://xdaforums.com/showthread.php?t=1125587

http://xdaforums.com/showthread.php?t=1125587http://xdaforums.com/showthread.php?t=1125587​

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--TheMiltos21,I hope you enjoy your device better :D