[Xperia Z1 Q&A, Help & Troubleshooting] drakul123:
I installed Trinity ROM 2 weeks ago; the booting time was really slow, and it was randomly restarting my device but there were a couple other features I liked so I decided to keep it. I installed the Trinity kernel too but I had a locked bootloader, so it wouldn't work, and by flashtools I reinstalled the stock kernel. It worked as before (still with the slow rebooting and restarting randomly)

After a few days the restarting got annoying and posted on the Trinity forum; someone there suggested to do a factory reset, then install it again and it should fix the mistakes. I did a full wipe from the recovery mode; it gave an option I haven't seen before on an android "factory reset to install ROM", the other option was only "factory reset". I did the "factory reset to install ROM", after that I tried to access my sd card to install the ROM, but it said "no sd card" I tried several times to run the sd card but wouldnt work. Took sd card out, placed it in another phone and it was working fine; I figured rebooting the phone would solve whatever was going on in it. I rebooted it and that was it, it never turned on again; I can't access recovery mode or anything.

It only vibrates when I press vol up + power buttons together for 5 seconds; and the red led light is on and off.

It only goes to the sony screen (start up after rebooting, all screen black and just says "sony" in the middle)

Was told to use flashtools, I did, it flashed the stock kernel properly, but phone doesnt start after that, remains with led light red, on and off.

This is the text I got.

08/050/2014 12:50:42 - INFO - Flashtool Version 0.9.18.2 built on 09-06-2014 22:30:00
08/050/2014 12:50:42 - INFO - Executing search strategies to find proxy selector
08/050/2014 12:50:43 - INFO - No proxy found for IE. Trying next one
08/050/2014 12:50:43 - INFO - No proxy found for firefox. Trying next one
08/050/2014 12:50:43 - INFO - No proxy found for java. Trying next one
08/050/2014 12:50:44 - INFO - Syncing devices from github
08/050/2014 12:50:44 - INFO - Scanning devices folder for changes.
08/051/2014 12:51:01 - INFO - Pulling changes from github.
08/051/2014 12:51:02 - INFO - Devices sync finished.
08/051/2014 12:51:03 - INFO - Device disconnected
08/051/2014 12:51:50 - INFO - Device connected in flash mode
08/051/2014 12:51:59 - ERROR - This action needs a connected device in ADB mode
08/052/2014 12:52:04 - ERROR - This action can only be done in fastboot mode
08/052/2014 12:52:14 - INFO - Device Status: NOT FOUND
08/052/2014 12:52:18 - INFO - Device Status: NOT FOUND
08/052/2014 12:52:25 - ERROR - This action can only be done in fastboot mode
08/052/2014 12:52:51 - INFO - Device disconnected
08/052/2014 12:52:52 - INFO - Selected Bundle for Sony Xperia Z1 (C6906). FW release : 14.4.A.0.108. Customization : Customized_US
08/052/2014 12:52:52 - INFO - Preparing files for flashing
08/052/2014 12:52:53 - INFO - Please connect your device into flashmode.
08/054/2014 12:54:03 - INFO - Device connected in flash mode
08/054/2014 12:54:03 - INFO - Opening device for R/W
08/054/2014 12:54:03 - INFO - Reading device information
08/054/2014 12:54:03 - INFO - Phone ready for flashmode operations.
08/054/2014 12:54:03 - INFO - Current device : C6906 - BH9010CF08 - 1276-7275_R8C - 1274-8313_14.4.A.0.133 - VODAFONE1-LTE_14.4.A.0.133
08/054/2014 12:54:03 - INFO - Start Flashing
08/054/2014 12:54:03 - INFO - Processing loader.sin
08/054/2014 12:54:03 - INFO - Checking header
08/054/2014 12:54:03 - INFO - Flashing data
08/054/2014 12:54:03 - INFO - Processing of loader.sin finished.
08/054/2014 12:54:04 - INFO - Loader : S1_Root_6732 - Version : LOADER_RELEASE_MSM8974_28_AID_4 / Boot version : S1_Boot_MSM8974_Rhine1.2_LA1.04_19 / Bootloader status : NOT_ROOTABLE
08/054/2014 12:54:04 - INFO - Processing partition-image.sin
08/054/2014 12:54:04 - INFO - Checking header
08/054/2014 12:54:04 - INFO - Flashing data
08/054/2014 12:54:04 - INFO - Processing of partition-image.sin finished.
08/054/2014 12:54:04 - INFO - Parsing boot delivery
08/054/2014 12:54:04 - INFO - Phone boot version : S1_Boot_MSM8974_Rhine1.2_LA1.04_19. Boot delivery version : S1_Boot_MSM8974_Rhine1.2_LA1.04_19
08/054/2014 12:54:04 - INFO - Boot delivery up to date. Nothing to do
08/054/2014 12:54:04 - INFO - Processing kernel.sin
08/054/2014 12:54:04 - INFO - Checking header
08/054/2014 12:54:04 - INFO - Flashing data
08/054/2014 12:54:05 - INFO - Processing of kernel.sin finished.
08/054/2014 12:54:05 - INFO - Processing rpm.sin
08/054/2014 12:54:05 - INFO - Checking header
08/054/2014 12:54:05 - INFO - Flashing data
08/054/2014 12:54:06 - INFO - Processing of rpm.sin finished.
08/054/2014 12:54:06 - INFO - Processing fotakernel.sin
08/054/2014 12:54:06 - INFO - Checking header
08/054/2014 12:54:06 - INFO - Flashing data
08/054/2014 12:54:07 - INFO - Processing of fotakernel.sin finished.
08/054/2014 12:54:07 - INFO - Processing amss_fs_2.sin
08/054/2014 12:54:07 - INFO - Checking header
08/054/2014 12:54:07 - INFO - Flashing data
08/054/2014 12:54:07 - INFO - Processing of amss_fs_2.sin finished.
08/054/2014 12:54:07 - INFO - Processing amss_fs_1.sin
08/054/2014 12:54:07 - INFO - Checking header
08/054/2014 12:54:07 - INFO - Flashing data
08/054/2014 12:54:07 - INFO - Processing of amss_fs_1.sin finished.
08/054/2014 12:54:07 - INFO - Processing amss_fsg.sin
08/054/2014 12:54:07 - INFO - Checking header
08/054/2014 12:54:07 - INFO - Flashing data
08/054/2014 12:54:07 - INFO - Processing of amss_fsg.sin finished.
08/054/2014 12:54:07 - INFO - Processing elabel-C6906-row_201309261655.1_14.4.A.0.108.sin
08/054/2014 12:54:07 - INFO - Checking header
08/054/2014 12:54:07 - INFO - Flashing data
08/054/2014 12:54:10 - INFO - Processing of elabel-C6906-row_201309261655.1_14.4.A.0.108.sin finished.
08/054/2014 12:54:10 - INFO - Flashing fota-reset.ta
08/054/2014 12:54:10 - INFO - Writing TA unit : [00, 00, 09, 64, 00, 00, 00, 01, 00]
08/054/2014 12:54:10 - INFO - Flashing cust-reset.ta
08/054/2014 12:54:10 - INFO - Custumization reset is now based on UI choice
08/054/2014 12:54:10 - INFO - Resetting customizations
08/054/2014 12:54:10 - INFO - Writing TA unit : [00, 00, 08, A4, 00, 00, 00, 0E, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00]
08/054/2014 12:54:10 - INFO - Ending flash session
08/054/2014 12:54:10 - INFO - Flashing finished.
08/054/2014 12:54:10 - INFO - Please unplug and start your phone
08/054/2014 12:54:10 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings
08/054/2014 12:54:11 - INFO - Device connected in flash mode
08/055/2014 12:55:27 - ERROR - This action needs a connected device in ADB mode
08/055/2014 12:55:30 - ERROR - This action can only be done in fastboot mode
08/055/2014 12:55:37 - INFO - Device disconnected

I was told to do dual recovery, it takes time for it to recognize the device is plugged in, then it recognizes it, but doesn't do anything to it.

Here is an image attached of the text I get.

At the moment I blame the custom ROM Trinity for xperia Z1, because that's the one which was installed when the new installation was going to take place. However, I just wanna install the stock sony rom and have a working normal phone. (better to have sony bootloads than a phone not working properly).

I was told it was my own mistake, but I am giving the details of everything I did. And all I did was following instructions posted on the thread. So that is not really my mistake. I would not be that stupid as to "make my own personal way" of installing random roms, knowing it may make the phone not work; I did research as to which rom would be fit for my device, and the only one promoting to do so was Trinity ROM.

The guy from the place I bought the device at told me to take sim card out, and I would find a red button there, to press it for 5 seconds and it would restart it all. Tried it and nothing happened.

The phone is 2 weeks old and has been extremely well taken care of, it is in like new condition when it comes to hardware, as far as I am aware of.

Any suggestions I should check on to finally fix this?

Are you up to help me fix this and be this Xperia's hero?

Thanks