[Xperia Z1 Q&A, Help & Troubleshooting] trancephorm:
I have .157 and I need to downgrade to C690X_14.4.A.0.108_KernelOnly.ftf, to be able to root it with rootkitXperia_20140719.zip.

Tried with various versions of FlashTool, including newest one 0.9.19.10. Thing is, everything looks normal, it's like it succeeded downgrading it, but still when I go to About section I can still see .157?! I won't try to root it until I see .108 there..... Here's FlashTool log, tried with both enabled and disabled FSC file, USB debugging is on and Installation from unknown sources is on.

10/051/2015 19:51:25 - INFO - Flashtool Version 0.9.19.10 built on 04-10-2015 21:00:00

10/051/2015 19:51:25 - INFO - libusb version 1.0.20

10/051/2015 19:51:25 - INFO - Executing search strategies to find proxy selector

10/051/2015 19:51:25 - INFO - No proxy found for gnome. Trying next one

10/051/2015 19:51:25 - INFO - No proxy found for kde. Trying next one

10/051/2015 19:51:25 - INFO - No proxy found for firefox. Trying next one

10/051/2015 19:51:25 - INFO - Syncing devices from github

10/051/2015 19:51:26 - INFO - Scanning devices folder for changes.

10/051/2015 19:51:31 - INFO - Pulling changes from github.

10/051/2015 19:51:32 - INFO - Devices sync finished.

10/051/2015 19:51:35 - INFO - Device connected with USB debugging on

10/051/2015 19:51:36 - INFO - Connected device : Sony Xperia Z1

10/051/2015 19:51:36 - INFO - Installed version of busybox : N/A

10/051/2015 19:51:36 - INFO - Android version : 4.4.4 / kernel version : 3.4.0-perf-g0109737 / Build number : 14.4.A.0.157

10/055/2015 19:55:59 - INFO - Selected Bundle for Sony Xperia Z1 (C6902). FW release : 14.4.A.0.108. Customization : KernelOnly

10/055/2015 19:55:59 - INFO - Preparing files for flashing

10/055/2015 19:55:59 - INFO - Please connect your device into flashmode.

10/056/2015 19:56:03 - INFO - Device disconnected

10/056/2015 19:56:19 - INFO - Device connected in flash mode

10/056/2015 19:56:19 - INFO - Opening device for R/W

10/056/2015 19:56:19 - INFO - Device ready for R/W.

10/056/2015 19:56:19 - INFO - Reading device information

10/056/2015 19:56:19 - INFO - Phone ready for flashmode operations.

10/056/2015 19:56:19 - INFO - Opening TA partition 2

10/056/2015 19:56:20 - INFO - Current device : C6902 - BH9080LK1J - 1291-4830_R2C - 1272-6084_14.4.A.0.108 - GLOBAL-HSPA_14.4.A.0.157

10/056/2015 19:56:20 - INFO - Closing TA partition

10/056/2015 19:56:20 - INFO - Start Flashing

10/056/2015 19:56:20 - INFO - Processing loader.sin

10/056/2015 19:56:20 - INFO - Checking header

10/056/2015 19:56:20 - INFO - Flashing data

10/056/2015 19:56:20 - INFO - Loader : S1_Root_6732 - Version : LOADER_RELEASE_MSM8974_28_AID_4 / Boot version : S1_Boot_MSM8974_Rhine1.2_LA1.04_19 / Bootloader status : ROOTABLE

10/056/2015 19:56:20 - INFO - Max packet size set to 512K

10/056/2015 19:56:20 - INFO - Making a TA backup

10/056/2015 19:56:20 - INFO - Opening TA partition 1

10/056/2015 19:56:20 - INFO - Start Dumping TA partition 1

10/056/2015 19:56:20 - INFO - Finished Dumping TA partition 1

10/056/2015 19:56:20 - INFO - TA partition 1 saved to /root/.flashTool/registeredDevices/BH9080LK1J/s1ta/2015-10-10_07-56-20/1.ta

10/056/2015 19:56:20 - INFO - Closing TA partition

10/056/2015 19:56:20 - INFO - Opening TA partition 2

10/056/2015 19:56:21 - INFO - Start Dumping TA partition 2

10/056/2015 19:56:21 - INFO - Finished Dumping TA partition 2

10/056/2015 19:56:21 - INFO - TA partition 2 saved to /root/.flashTool/registeredDevices/BH9080LK1J/s1ta/2015-10-10_07-56-20/2.ta

10/056/2015 19:56:21 - INFO - Closing TA partition

10/056/2015 19:56:28 - INFO - No flash script found. Using 0.9.18 flash engine

10/056/2015 19:56:28 - INFO - Opening TA partition 2

10/056/2015 19:56:28 - INFO - Writing TA unit 00002774. Value : [01]

10/056/2015 19:56:28 - INFO - Closing TA partition

10/056/2015 19:56:28 - INFO - Opening TA partition 2

10/056/2015 19:56:28 - INFO - Closing TA partition

10/056/2015 19:56:28 - INFO - Opening TA partition 2

10/056/2015 19:56:28 - INFO - Processing kernel.sin

10/056/2015 19:56:28 - INFO - Checking header

10/056/2015 19:56:28 - INFO - Flashing data

10/056/2015 19:56:30 - INFO - Processing rpm.sin

10/056/2015 19:56:30 - INFO - Checking header

10/056/2015 19:56:30 - INFO - Flashing data

10/056/2015 19:56:30 - INFO - Closing TA partition

10/056/2015 19:56:30 - INFO - Opening TA partition 2

10/056/2015 19:56:30 - INFO - Closing TA partition

10/056/2015 19:56:30 - INFO - Opening TA partition 2

10/056/2015 19:56:30 - INFO - Closing TA partition

10/056/2015 19:56:30 - INFO - Opening TA partition 2

10/056/2015 19:56:30 - INFO - Closing TA partition

10/056/2015 19:56:30 - INFO - Opening TA partition 2

10/056/2015 19:56:30 - INFO - Writing TA unit 00002725. Value : [32, 30, 31, 35, 2D, 31, 30, 2D, 31, 30, 20, 31, 39, 3A, 35, 36, 3A, 33, 30, 00]

10/056/2015 19:56:30 - INFO - Writing TA unit 00002774. Value : [00]

10/056/2015 19:56:31 - INFO - Closing TA partition

10/056/2015 19:56:31 - INFO - Ending flash session

10/056/2015 19:56:31 - INFO - Flashing finished.

10/056/2015 19:56:31 - INFO - Please unplug and start your phone

10/056/2015 19:56:31 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings

10/056/2015 19:56:31 - INFO - Device connected in flash mode

10/056/2015 19:56:46 - INFO - Device disconnected