[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] YTayyar:
Hello ...

I'v recently downgraded my mini pro to .42 to do a root, I am new to this and I found a way using zergrush.

whenever I try rooting I have the following error:

---------------------------------------------------------------
Easy rooting toolkit (v4.0)
created by DooMLoRD
using exploit zergRush (Revolutionary Team)
Credits go to all those involved in making this possible!
---------------------------------------------------------------
[*] This script will:
(1) root ur device using latest zergRush exploit (21 Nov)
(2) install Busybox (1.18.4)
(3) install SU files (binary: 3.0.3 and apk: 3.0.6)
(4) some checks for free space, tmp directory
(will remove Google Maps if required)
[*] Before u begin:
(1) make sure u have installed adb drivers for ur device
(2) enable "USB DEBUGGING"
from (Menu\Settings\Applications\Development)
(3) enable "UNKNOWN SOURCES"
from (Menu\Settings\Applications)
(4) [OPTIONAL] increase screen timeout to 10 minutes
(5) connect USB cable to PHONE and then connect to PC
(6) skip "PC Companion Software" prompt on device
---------------------------------------------------------------
CONFIRM ALL THE ABOVE THEN
Press any key to continue . . .
--- STARTING ----
--- WAITING FOR DEVICE
--- creating temporary directory
mkdir failed for tmp, File exists
--- cleaning
--- pushing zergRush
721 KB/s (23060 bytes in 0.031s)
--- correcting permissions
--- executing zergRush

[**] Zerg rush - Android 2.2/2.3 local root
[**] (C) 2011 Revolutionary. All rights reserved.

[**] Parts of code from Gingerbreak, (C) 2010-2011 The Android Exploid Crew.

[+] Found a GingerBread ! 0x00000118
[+] Found a ... mode
[*] Scooting ...
[*] Sending 149 zerglings ...
[*] Sending 189 zerglings ...
[-] Hellions with BLUE flames !
--- WAITING FOR DEVICE TO RECONNECT
if it gets stuck over here for a long time then try:
disconnect usb cable and reconnect it
toggle "USB DEBUGGING" (first disable it then enable it)
--- DEVICE FOUND
--- pushing busybox
731 KB/s (1075144 bytes in 1.435s)
--- correcting permissions
--- remounting /system
mount: permission denied (are you root?)
--- checking free space on /system
0 KB/s (439 bytes in 1.000s)
df: /mnt/.lfs: Function not implemented
--- Free space on /system : 433300 bytes
--- no cleanup required
--- copying busybox to /system/xbin/
/system/xbin/busybox: cannot open for write: Read-only file system
--- correcting ownership
Unable to chmod /system/xbin/busybox: No such file or directory
--- correcting permissions
Unable to chmod /system/xbin/busybox: No such file or directory
--- installing busybox
/system/xbin/busybox: not found
--- pushing SU binary
failed to copy 'files\su' to '/system/bin/su': Read-only file system
--- correcting ownership
Unable to chmod /system/bin/su: No such file or directory
--- correcting permissions
Unable to chmod /system/bin/su: No such file or directory
--- correcting symlinks
rm failed for /system/xbin/su, Read-only file system
link failed Read-only file system
--- pushing Superuser app
failed to copy 'files\Superuser.apk' to '/system/app/./Superuser.apk': Read-only
file system
--- cleaning
--- rebooting
ALL DONE!!!
Press any key to continue . . .

Any one can help please????

I used the files in this thread:

http://xdaforums.com/showthread.php?t=1695514

and every thing is ok now