[Xperia Arc Q&A, Help & Troubleshooting] stinger88:
i have LT18i rom ics 4.0.4 rooted by DooMLoRD_v1_Xperia-2011-ICS-ROOT-emu-busybox-su_2 and i could not flash any kernel .. show this log from flashtool:

10/024/2013 17:24:38 - INFO - <- This level is successfully initialized

10/024/2013 17:24:38 - INFO - Flashtool Version 0.9.10.1 built on 2013-01-09 19:49:47

10/024/2013 17:24:38 - INFO - You can drag and drop ftf files here to start flashing them

10/024/2013 17:24:43 - INFO - Device connected in fastboot mode

10/025/2013 17:25:00 - INFO - Flash canceled

10/025/2013 17:25:24 - INFO - Launching Fastboot Toolbox 1.0 by DooMLoRD

10/025/2013 17:25:24 - INFO - Device Status: FASTBOOT mode

10/025/2013 17:25:44 - INFO - Selected kernel (boot.img or kernel.sin): F:\======Phone dossier (3)======\arc s\[ROM][ICS][24][ArcsPro]Revolution ICS HD™[build 7][REVOLUTION]Z-Styled\boot_anzu_bat.img

10/025/2013 17:25:44 - INFO - Flashing selected kernel

10/025/2013 17:25:44 - INFO - sending 'boot' (5224 KB)...

10/025/2013 17:25:44 - INFO - FAILED (remote: The Device must be rooted first)

10/025/2013 17:25:44 - INFO - finished. total time: 0.001s

10/025/2013 17:25:44 - INFO - FASTBOOT Output:

sending 'boot' (5224 KB)...

FAILED (remote: The Device must be rooted first)

finished. total time: 0.001s

10/025/2013 17:25:44 - INFO - Please check the log before rebooting into system

10/025/2013 17:25:56 - INFO - Finished Fastboot Toolbox

10/026/2013 17:26:42 - INFO - Device disconnected

10/026/2013 17:26:55 - INFO - Device connected in fastboot mode

10/027/2013 17:27:03 - INFO - Launching Fastboot Toolbox 1.0 by DooMLoRD

10/027/2013 17:27:03 - INFO - Device Status: FASTBOOT mode

10/027/2013 17:27:17 - INFO - Selected kernel (boot.img or kernel.sin): F:\======Phone dossier (3)======\arc s\[ROM][ICS][24][ArcsPro]Revolution ICS HD™[build 7][REVOLUTION]Z-Styled\boot_anzu_bat.img

10/027/2013 17:27:17 - INFO - Flashing selected kernel

10/027/2013 17:27:17 - INFO - sending 'boot' (5224 KB)...

10/027/2013 17:27:17 - INFO - FAILED (remote: The Device must be rooted first)

10/027/2013 17:27:17 - INFO - finished. total time: 0.002s

10/027/2013 17:27:17 - INFO - FASTBOOT Output:

sending 'boot' (5224 KB)...

FAILED (remote: The Device must be rooted first)

finished. total time: 0.002s

10/027/2013 17:27:17 - INFO - Please check the log before rebooting into system

10/027/2013 17:27:27 - INFO - Device Status: FASTBOOT mode

10/027/2013 17:27:32 - INFO - Fetching connected device info

10/027/2013 17:27:32 - INFO - Connected device info: [ BX90371ZL8&ZLP ]

10/027/2013 17:27:49 - INFO - Device will now exit fastboot mode and start booting into system

10/027/2013 17:27:49 - INFO - Device disconnected

10/027/2013 17:27:50 - INFO - Device connected in flash mode

10/028/2013 17:28:16 - INFO - Device disconnected

10/031/2013 17:31:27 - INFO - Finished Fastboot Toolbox

10/037/2013 17:37:01 - INFO - Device connected in fastboot mode

10/038/2013 17:38:36 - INFO - Device disconnected

10/040/2013 17:40:32 - INFO - Device connected in fastboot mode

10/041/2013 17:41:28 - INFO - Selected LT18i_4.1.B.0.587_Kernel.ftf

10/041/2013 17:41:28 - INFO - Preparing files for flashing

10/041/2013 17:41:28 - INFO - Please connect your device into flashmode.

10/041/2013 17:41:32 - INFO - Device disconnected

10/041/2013 17:41:34 - INFO - Device connected in flash mode

10/041/2013 17:41:35 - INFO - Opening device for R/W

10/041/2013 17:41:35 - INFO - Reading device information

10/041/2013 17:41:35 - INFO - Phone ready for flashmode operations.

10/041/2013 17:41:35 - INFO - Current device : LT18i - BX90371ZL8 - 1254-2284_R1I - 1253-8238_4.1.B.0.587 - WORLD-i_4.1.B.0.587

10/041/2013 17:41:35 - INFO - Start Flashing

10/041/2013 17:41:35 - INFO - Processing loader

10/041/2013 17:41:35 - INFO - Checking header

10/041/2013 17:41:35 - INFO - Flashing data

10/041/2013 17:41:38 - INFO - Loader : S1_Loader_Root_773f - Version : R4A066 / Bootloader status : ROOTABLE

10/041/2013 17:41:38 - INFO - Disabling final data verification check

10/041/2013 17:41:38 - INFO - Processing kernel.sin

10/041/2013 17:41:38 - INFO - Checking header

10/041/2013 17:41:38 - INFO - Flashing data

10/041/2013 17:41:40 - INFO - Ending flash session

10/041/2013 17:41:40 - INFO - Flashing finished.

10/041/2013 17:41:40 - INFO - Please unplug and start your phone

10/041/2013 17:41:40 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings

10/041/2013 17:41:40 - INFO - Device connected in flash mode

10/041/2013 17:41:43 - INFO - Device disconnected

please help to flash stock kernel...... thanks