[Xperia Arc Q&A, Help & Troubleshooting] tsoifun:
What was happened is: I left the phone (Arc S LT18i) and friend of mine tried to flash with ftf files (because yesterday we stuck with SONY LOG) BUT somehow he flashed "mk16i_4.1.B.0.431_ready to root" and now device is shown is EXPERIA PRO (mk16i) .....

we can't flash any other ftf files e.g. "LT18i_4.1.B.0.587_(1254-2184))" or "lt18i_4.1.B.0.431_ready to root" - phone gets into flashmode but if we try to flash it shows ERROR and stops flushing:

Flashtool 0.9.11.00

27/053/2013 13:53:45 - INFO - Selected LT18i / 4.1.B.0.587 / (1254-2184)

27/053/2013 13:53:45 - INFO - Preparing files for flashing

27/054/2013 13:54:05 - INFO - Please connect your device into flashmode.

27/054/2013 13:54:47 - INFO - Device connected in flash mode

27/054/2013 13:54:47 - INFO - Opening device for R/W

27/054/2013 13:54:48 - INFO - Device connected in flash mode

27/054/2013 13:54:48 - INFO - Start Flashing

27/054/2013 13:54:48 - INFO - Processing loader

27/054/2013 13:54:48 - INFO - Checking header

27/054/2013 13:54:48 - INFO - Ending flash session

27/054/2013 13:54:48 - ERROR -

27/054/2013 13:54:48 - ERROR - Error flashing. Aborted

27/054/2013 13:54:48 - INFO - Device connected in flash mode

**************************************

27/055/2013 13:55:15 - INFO - <- This level is successfully initialized

27/055/2013 13:55:15 - INFO - Flashtool Version 0.9.11.0 built on 2013-06-04 22:50:00

27/055/2013 13:55:19 - INFO - Device disconnected

27/055/2013 13:55:36 - INFO - Selected lt18i / 4.1.B.0.431 / ready to root

27/055/2013 13:55:36 - INFO - Preparing files for flashing

27/056/2013 13:56:17 - INFO - Please connect your device into flashmode.

27/057/2013 13:57:26 - INFO - Device connected in flash mode

27/057/2013 13:57:26 - INFO - Opening device for R/W

27/057/2013 13:57:26 - INFO - Start Flashing

27/057/2013 13:57:26 - INFO - Processing loader

27/057/2013 13:57:26 - INFO - Checking header

27/057/2013 13:57:26 - INFO - Ending flash session

27/057/2013 13:57:26 - ERROR -

27/057/2013 13:57:26 - ERROR - Error flashing. Aborted

27/057/2013 13:57:27 - INFO - Device connected in flash mode

Found also file

stderr.log which shows following:

java.io.IOException: Unable to read from device

at flashsystem.io.USBFlashWin32.windowsOpen(USBFlashWin32.java:19)

at flashsystem.io.USBFlash.open(USBFlash.java:15)

at flashsystem.X10flash.openDevice(X10flash.java:480)

at flashsystem.X10flash.openDevice(X10flash.java:416)

at gui.tools.FlashJob.run(FlashJob.java:36)

at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

java.lang.NullPointerException

at flashsystem.X10flash.processHeader(X10flash.java:210)

at flashsystem.X10flash.uploadImage(X10flash.java:226)

at flashsystem.X10flash.sendLoader(X10flash.java:300)

at flashsystem.X10flash.flashDevice(X10flash.java:384)

at gui.tools.FlashJob.run(FlashJob.java:37)

at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

flashsystem.X10FlashException

at flashsystem.X10flash.uploadImage(X10flash.java:239)

at flashsystem.X10flash.sendLoader(X10flash.java:300)

at flashsystem.X10flash.flashDevice(X10flash.java:384)

at gui.tools.FlashJob.run(FlashJob.java:37)

at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

Is it a problem with flashtool itself?...

Got lost really...