[Flashtool] ERROR - Error flashing. Aborted - Xperia X10 mini pro problems

Hi all,

I made a mistake and selected wrong file on SD Card in xRecovery menu and installed wrong ROM on my Xperia x10 mini pro.
I actually installed ROM for Xperia x10 mini.

After this operation buttons did not work, same with touch screen - no response at all.

Then I thought it was always possible to reload stock software using SEUS/ PC Companion/ Xperia Companion. But wrong - it does not work, Xperia Companion gives an error "Błąd podczas naprawy oprogramowania
Podczas naprawiania urządzenia wystąpił błąd.
Spróbuj ponownie. Jeśli problem będzie nadal występował, skontaktuj się z działem pomocy technicznej firmy Sony.
Kod błędu: UEGetPhoneInfoMissingInfo
E10i 0124 1236-0516 R5B 2.1.1.A.0.6"

This means that there was an error, gives an error code and suggesting to contact Sony if problem still exists.

That means trouble. I decide to use Flashtool. I never did it before but what can I loose, right?

I found a stock ROM and tried to flash the phone. But Flashtool gives an error as well:
"11/046/2016 23:46:52 - INFO - <- This level is successfully initialized
11/046/2016 23:46:52 - INFO - Flashtool Version 0.9.22.3 built on 08-06-2016 22:30:00
11/046/2016 23:46:52 - INFO - Executing search strategies to find proxy selector
11/046/2016 23:46:53 - INFO - No proxy found for IE. Trying next one
11/046/2016 23:46:53 - INFO - No proxy found for firefox. Trying next one
11/046/2016 23:46:53 - INFO - No proxy found for java. Trying next one
11/046/2016 23:46:53 - INFO - Syncing devices from github
11/046/2016 23:46:53 - INFO - Opening devices repository.
11/046/2016 23:46:53 - INFO - Scanning devices folder for changes.
11/047/2016 23:47:00 - INFO - Pulling changes from github.
11/047/2016 23:47:01 - INFO - Quietly closing devices repository.
11/047/2016 23:47:01 - INFO - Devices sync finished.
11/047/2016 23:47:01 - INFO - Loading devices database
11/047/2016 23:47:01 - INFO - Loaded 91 devices
11/047/2016 23:47:01 - INFO - Starting phone detection
11/047/2016 23:47:05 - INFO - Device disconnected
11/047/2016 23:47:13 - INFO - Selected Bundle for SonyEricson X10 Mini Pro(U20i). FW release : 2.1.1.A.0.28. Customization : KR
11/047/2016 23:47:13 - INFO - Preparing files for flashing
11/047/2016 23:47:16 - INFO - Please connect your device into flashmode.
11/047/2016 23:47:21 - INFO - Device connected in flash mode
11/047/2016 23:47:21 - INFO - Opening device for R/W
11/047/2016 23:47:21 - INFO - Reading device information
11/047/2016 23:47:21 - INFO - Phone ready for flashmode operations.
11/047/2016 23:47:21 - INFO - Opening TA partition 2
11/047/2016 23:47:21 - INFO - Current device : E10i - CB511PXYDU - 1236-0516_R5B - 1235-3411_2.1.1.A.0.6 - WORLD-1-8_2.1.1.C.0.0
11/047/2016 23:47:21 - INFO - Closing TA partition
11/047/2016 23:47:21 - INFO - Start Flashing
11/047/2016 23:47:21 - INFO - Processing loader.sin
11/047/2016 23:47:21 - INFO - Checking header
11/047/2016 23:47:21 - INFO - Flashing data
11/047/2016 23:47:23 - INFO - Loader : S1_Loader_Root_8e35 - Version : R4A045 / Boot version : R8A029 / Bootloader status : UNROOTABLE
11/047/2016 23:47:23 - INFO - Max packet size set to 64K
11/047/2016 23:47:23 - INFO - USB buffer size set to 512K
11/047/2016 23:47:23 - INFO - No flash script found. Using 0.9.18 flash engine
11/047/2016 23:47:23 - INFO - Opening TA partition 2
11/047/2016 23:47:23 - INFO - Writing TA unit 00002774. Value : 01
11/047/2016 23:47:23 - INFO - Closing TA partition
11/047/2016 23:47:23 - INFO - Opening TA partition 2
11/047/2016 23:47:23 - INFO - Closing TA partition
11/047/2016 23:47:23 - INFO - Opening TA partition 2
11/047/2016 23:47:23 - INFO - Processing amss.sin
11/047/2016 23:47:23 - INFO - Checking header
11/047/2016 23:47:23 - INFO - Flashing data
11/047/2016 23:47:35 - INFO - Processing amss_fs_mimmi_BC18.sin
11/047/2016 23:47:35 - INFO - Checking header
11/047/2016 23:47:35 - INFO - Flashing data
11/047/2016 23:47:35 - INFO - Processing cache.sin
11/047/2016 23:47:35 - INFO - Checking header
11/047/2016 23:47:35 - INFO - Flashing data
11/047/2016 23:47:36 - INFO - Processing fota0.sin
11/047/2016 23:47:36 - INFO - Checking header
11/047/2016 23:47:36 - INFO - Flashing data
11/047/2016 23:47:36 - INFO - Processing fota1.sin
11/047/2016 23:47:36 - INFO - Checking header
11/047/2016 23:47:36 - INFO - Flashing data
11/047/2016 23:47:37 - INFO - Processing kernel.sin
11/047/2016 23:47:37 - INFO - Checking header
11/047/2016 23:47:37 - INFO - Flashing data
11/047/2016 23:47:40 - INFO - Processing loader1.sin
11/047/2016 23:47:40 - INFO - Checking header
11/047/2016 23:47:40 - ERROR - Processing of loader1.sin finished with errors.
11/047/2016 23:47:40 - INFO - Ending flash session
11/047/2016 23:47:40 - ERROR -
11/047/2016 23:47:40 - ERROR - Error flashing. Aborted
11/047/2016 23:47:40 - INFO - Flashing finished.
11/047/2016 23:47:40 - INFO - Please unplug and start your phone
11/047/2016 23:47:40 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings
11/047/2016 23:47:40 - INFO - Device connected in flash mode"

Can someone please tell me what that means? How can I check Unknown Sources and Debugging if I can not turn on the phone?
Is it really necesary? I read somewhere that Flashtool does not need it. Now I am confused...

Can anything be done to solve this issue and get my Xperia work again?