[Xperia SP Q&A, Help & Troubleshooting] rooney_di_spacy:
I'm trying to flash rom via flashtool and it said:

06/059/2015 22:59:54 - INFO - <- This level is successfully initialized

06/059/2015 22:59:54 - INFO - Flashtool Version 0.9.11.0 built on 2013-06-04 22:50:00

06/000/2015 23:00:03 - INFO - Device connected with USB debugging off

06/000/2015 23:00:03 - INFO - For 2011 devices line, be sure you are not in MTP mode

06/000/2015 23:00:06 - INFO - Device connected with USB debugging on

06/000/2015 23:00:06 - INFO - Connected device : Sony Xperia SP

06/000/2015 23:00:06 - INFO - Installed version of busybox : BusyBox v1.22.1 bionic (2014-09-28 20:55 +0500) multi-call binary.

06/000/2015 23:00:06 - INFO - Android version : 4.4.4 / kernel version : 3.4.0-perf-g4c8352f-00783-gce6e17b / Build number : KTU84P

06/000/2015 23:00:06 - INFO - Checking root access

06/000/2015 23:00:06 - INFO - Root Access Allowed

06/000/2015 23:00:06 - INFO - Installing toolbox to device...

06/000/2015 23:00:06 - INFO - Pushing C:\Flashtool\custom\root\ftkit.tar to /data/local/tmp

06/000/2015 23:00:07 - INFO - Running installftkit as root thru sysrun

06/001/2015 23:01:11 - INFO - Selected C5303 / 12.1.A.1.201 / 1272-3352_R1A

06/001/2015 23:01:11 - INFO - Preparing files for flashing

06/002/2015 23:02:42 - INFO - Please connect your device into flashmode.

06/002/2015 23:02:56 - INFO - Device disconnected

06/003/2015 23:03:22 - INFO - Device connected in flash mode

06/003/2015 23:03:23 - INFO - Opening device for R/W

06/003/2015 23:03:23 - INFO - Reading device information

06/003/2015 23:03:23 - INFO - Phone ready for flashmode operations.

06/003/2015 23:03:23 - INFO - Current device : C5303 - YT9109F756 - 1272-3352_R1B - 1272-3352_12.1.A.1.207 - GLOBAL-LTE_12.1.A.1.207

06/003/2015 23:03:23 - INFO - Start Flashing

06/003/2015 23:03:23 - INFO - Processing loader

06/003/2015 23:03:23 - INFO - Checking header

06/003/2015 23:03:23 - INFO - Flashing data

06/003/2015 23:03:27 - INFO - Loader : S1_Root_7054 - Version : R5G006 / Bootloader status : ROOTED

06/003/2015 23:03:27 - INFO - Processing partition-image.sin

06/003/2015 23:03:27 - INFO - Checking header

06/003/2015 23:03:27 - INFO - Flashing data

06/003/2015 23:03:27 - INFO - Processing kernel.sin

06/003/2015 23:03:27 - INFO - Checking header

06/003/2015 23:03:27 - INFO - Flashing data

06/003/2015 23:03:28 - INFO - Ending flash session

06/003/2015 23:03:28 - ERROR - Read error :31 : A device attached to the system is not functioning.

06/003/2015 23:03:28 - ERROR - Error flashing. Aborted

06/003/2015 23:03:29 - INFO - Device disconnected

06/003/2015 23:03:29 - INFO - Device connected in flash mode

06/004/2015 23:04:01 - INFO - Device disconnected

06/004/2015 23:04:01 - INFO - Device connected in flash mode

06/004/2015 23:04:02 - INFO - Device disconnected

06/004/2015 23:04:03 - INFO - Device connected in flash mode

06/004/2015 23:04:04 - INFO - Device disconnected

06/004/2015 23:04:04 - INFO - Device connected in flash mode

06/004/2015 23:04:08 - INFO - Device disconnected

06/004/2015 23:04:15 - INFO - Device connected in flash mode

06/004/2015 23:04:48 - INFO - Device disconnected

06/013/2015 23:13:39 - INFO - Flash canceled

06/013/2015 23:13:42 - INFO - Please connect your device into flashmode.

For now:

Hold Power: nothing happen :(

Power + Volume (+/-): nothing happen :(

Charge: nothing happen :(

what should I do? :(