[Sony Ericsson Xperia Neo, Pro] abirokz:
Hi i tried with s1tool... first 2 times i failed..3rd time i succeeded..these are the steps i followed..;)

> Download & extract, open s1tool

> Switch off your mobile

> Press and hold “BACK” button

> Then attach the turned off phone

NOTE: Windows won't find appropriate drivers. Show drivers folder which

u downloaded from attachment, Agree to install 'untrusted' drivers.

> s1tool identifies the device and it shows the next steps

like this

15-Mar-12 11:54:07 AM Welcome to S1 tool.

15-Mar-12 11:54:07 AM That is small and crippled subset of SETOOL2 service tool.

15-Mar-12 11:54:48 AM

15-Mar-12 11:54:48 AM DETACH USB CABLE FROM PHONE

15-Mar-12 11:54:48 AM REMOVE BATTERY FROM PHONE

15-Mar-12 11:54:48 AM ATTACH TESTPOINT

15-Mar-12 11:54:48 AM PRESS "READY", THEN ATTACH USB CABLE TO PHONE

15-Mar-12 11:54:48 AM

15-Mar-12 12:07:13 PM PROCESSING ...

15-Mar-12 12:07:14 PM REMOVE TESTPOINT NOW, THEN PRESS "READY"

15-Mar-12 12:07:14 PM

15-Mar-12 12:07:24 PM

15-Mar-12 12:07:24 PM TO CONNECT NEXT PHONES

15-Mar-12 12:07:24 PM X10 Xperia,E10 Mini,E15 Xperia X8,U20 Mini Pro

15-Mar-12 12:07:24 PM LT15 Xperia ARC,MT15 Xperia NEO,R800 Xperia PLAY

15-Mar-12 12:07:24 PM PRESS AND HOLD "BACK" BUTTON...

15-Mar-12 12:07:24 PM

15-Mar-12 12:07:24 PM ST18 Xperia RAY,ST15 Xperia Mini,SK17 Xperia Mini Pro

15-Mar-12 12:07:24 PM PRESS AND HOLD "Volume Down" BUTTON...

15-Mar-12 12:07:24 PM

15-Mar-12 12:07:24 PM PLEASE ATTACH TURNED OFF PHONE NOW

15-Mar-12 12:07:24 PM

15-Mar-12 12:07:24 PM

15-Mar-12 12:07:24 PM RUNNING S1_LOADER VER "R4A062"

15-Mar-12 12:07:24 PM LOADER AID: 0001

15-Mar-12 12:07:26 PM FLASH ID: "002C/00B3"

15-Mar-12 12:07:26 PM LOADER VERSION: "r4A069"

15-Mar-12 12:07:26 PM

15-Mar-12 12:07:26 PM

15-Mar-12 12:07:26 PM SEMC SIMLOCK CERTIFICATE, PROCEEDING

15-Mar-12 12:07:26 PM FINISHED

15-Mar-12 12:07:26 PM Elapsed:758 secs.

The important thing is that

>DETACH USB CABLE FROM PHONE

>REMOVE BATTERY FROM PHONE

>ATTACH TESTPOINT

>PRESS "READY", THEN ATTACH USB CABLE TO PHONE..

I tried first two times attached usb cable and then attached testpoint then the error was like this..

15-Mar-12 11:42:22 AM TO CONNECT NEXT PHONES

15-Mar-12 11:42:22 AM X10 Xperia,E10 Mini,E15 Xperia X8,U20 Mini Pro

15-Mar-12 11:42:22 AM LT15 Xperia ARC,MT15 Xperia NEO,R800 Xperia PLAY

15-Mar-12 11:42:22 AM PRESS AND HOLD "BACK" BUTTON...

15-Mar-12 11:42:22 AM

15-Mar-12 11:42:22 AM ST18 Xperia RAY,ST15 Xperia Mini,SK17 Xperia Mini Pro

15-Mar-12 11:42:22 AM PRESS AND HOLD "Volume Down" BUTTON...

15-Mar-12 11:42:22 AM

15-Mar-12 11:42:22 AM PLEASE ATTACH TURNED OFF PHONE NOW

15-Mar-12 11:42:22 AM

15-Mar-12 11:42:33 AM

15-Mar-12 11:42:33 AM RUNNING S1_EROM VER "R9A021"

15-Mar-12 11:42:33 AM SOFTWARE AID: 0001

15-Mar-12 11:42:33 AM LOADER AID: 0001

15-Mar-12 11:42:33 AM FATAL ERROR [ SECURITY_CLASS, SIN_header_verification_failed ]

15-Mar-12 11:42:33 AM error while uploading HDR block

15-Mar-12 11:42:33 AM LOADER NOT STARTED

15-Mar-12 11:42:33 AM Elapsed:56 secs.

I thought my phone is bricked..:D

bcs its difficult to attach test point first thn press ready and then USB..!

but nyways i handled third time with correct procedure..!

if hand slips to ny other testpoint..booom..:D

Hope this helps u..!:)

Cheers..