[Xperia Z3 Compact General] bradabrada:
Hey... I'm sorry for this noob question... I've done how someone said... named with ftf extension... and installed from flashmode... the problem is that my kernel still remain in .291 version....and I've tried multiple times.... here is what flashtool say:

18/047/2016 02:47:57 - INFO - Selected Bundle for Sony Xperia Z3 Compact(D5803). FW release : 23.5.A.0.575_R3D. Customization : stock kernel

18/047/2016 02:47:57 - INFO - Preparing files for flashing

18/047/2016 02:47:57 - INFO - Please connect your device into flashmode.

18/047/2016 02:47:58 - INFO - Opening device for R/W

18/047/2016 02:47:58 - INFO - Reading device information

18/047/2016 02:47:58 - INFO - Phone ready for flashmode operations.

18/047/2016 02:47:58 - INFO - Opening TA partition 2

18/047/2016 02:47:58 - INFO - Current device : D5803 - YT9115GCD3 - 1288-7915_R2D - 1285-6521_23.5.A.1.291 - GLOBAL-LTE_23.5.A.1.291

18/047/2016 02:47:58 - INFO - Closing TA partition

18/047/2016 02:47:58 - INFO - Start Flashing

18/047/2016 02:47:58 - INFO - Processing loader.sin

18/047/2016 02:47:58 - INFO - Checking header

18/047/2016 02:47:58 - INFO - Flashing data

18/047/2016 02:47:59 - INFO - Loader : S1_Root_9c84 - Version : MSM8974AB_27 / Boot version : S1_Boot_MSM8974AC_LA3.0_M_3 / Bootloader status : ROOTED

18/047/2016 02:47:59 - INFO - Max packet size set to 512K

18/047/2016 02:47:59 - INFO - USB buffer size set to 512K

18/048/2016 02:48:02 - INFO - Found a template session. Using it : C:\Users\Mobiplus\.flashTool\devices\D58XX\default.fsc

18/048/2016 02:48:02 - INFO - Opening TA partition 2

18/048/2016 02:48:02 - INFO - Writing TA unit 00002774. Value : 01

18/048/2016 02:48:02 - INFO - Closing TA partition

18/048/2016 02:48:02 - WARN - partition is excluded from bundle

18/048/2016 02:48:02 - INFO - Opening TA partition 2

18/048/2016 02:48:02 - INFO - Closing TA partition

18/048/2016 02:48:02 - INFO - Opening TA partition 2

18/048/2016 02:48:02 - WARN - Unit 2127 not found in bundle

18/048/2016 02:48:02 - WARN - Unit 2301 not found in bundle

18/048/2016 02:48:02 - INFO - Closing TA partition

18/048/2016 02:48:02 - INFO - Opening TA partition 2

18/048/2016 02:48:02 - WARN - dbi is excluded from bundle

18/048/2016 02:48:02 - WARN - emmc_appsboot is excluded from bundle

18/048/2016 02:48:02 - WARN - rpm is excluded from bundle

18/048/2016 02:48:02 - WARN - s1sbl is excluded from bundle

18/048/2016 02:48:02 - WARN - sbl1 is excluded from bundle

18/048/2016 02:48:02 - WARN - tz is excluded from bundle

18/048/2016 02:48:02 - INFO - Closing TA partition

18/048/2016 02:48:02 - INFO - Opening TA partition 2

18/048/2016 02:48:02 - WARN - cache is excluded from bundle

18/048/2016 02:48:02 - WARN - apps_log is excluded from bundle

18/048/2016 02:48:02 - WARN - kernel is excluded from bundle

18/048/2016 02:48:02 - WARN - fotakernel is excluded from bundle

18/048/2016 02:48:02 - INFO - Closing TA partition

18/048/2016 02:48:02 - INFO - Opening TA partition 2

18/048/2016 02:48:02 - WARN - userdata is excluded from bundle

18/048/2016 02:48:02 - WARN - system is excluded from bundle

18/048/2016 02:48:02 - WARN - amss_fs_1 is excluded from bundle

18/048/2016 02:48:03 - WARN - amss_fs_2 is excluded from bundle

18/048/2016 02:48:03 - WARN - amss_fsg is excluded from bundle

18/048/2016 02:48:03 - INFO - Closing TA partition

18/048/2016 02:48:03 - INFO - Opening TA partition 2

18/048/2016 02:48:03 - WARN - Unit 2212 not found in bundle

18/048/2016 02:48:03 - INFO - Closing TA partition

18/048/2016 02:48:03 - INFO - Opening TA partition 2

18/048/2016 02:48:03 - INFO - Closing TA partition

18/048/2016 02:48:03 - INFO - Opening TA partition 2

18/048/2016 02:48:03 - WARN - Unit 2404 not found in bundle

18/048/2016 02:48:03 - INFO - Closing TA partition

18/048/2016 02:48:03 - INFO - Opening TA partition 2

18/048/2016 02:48:03 - INFO - Closing TA partition

18/048/2016 02:48:03 - INFO - Opening TA partition 2

18/048/2016 02:48:03 - WARN - elabel is excluded from bundle

18/048/2016 02:48:03 - INFO - Closing TA partition

18/048/2016 02:48:03 - INFO - Opening TA partition 2

18/048/2016 02:48:03 - INFO - Writing TA unit 00002725. Value : 32 30 31 36 2D 31 31 2D 31 38 20 30 32 3A 34 38 3A 30 33 00

18/048/2016 02:48:03 - INFO - Writing TA unit 00002774. Value : 00

18/048/2016 02:48:03 - INFO - Closing TA partition

18/048/2016 02:48:03 - INFO - Ending flash session

18/048/2016 02:48:03 - INFO - Flashing finished.

18/048/2016 02:48:03 - INFO - Please unplug and start your phone

18/048/2016 02:48:03 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings