Hello, I’m new here. If this is the wrong place I post this, just tell me, I will delete it. I’m sorry form my bad English, just need some help.
Yesterday, I wanted to flash LineageOS 14.1 by nailyk on my Xperia Z3 (D6603).
Before that, my phone ran a rooted version of Android 6.01 by Sony. Bootloader locked.
First thing I did was to flash Android 4.4 (23.0.A.2.93) with flashtool. I used Giefroot, to root the device again and made simply a TA Backup. After this, I unlocked the Bootloader and flash the phone with Emma (the rom with .200 at the end). After flashing, I wasn’t able to access the Sony Recovery by pressing Volume-Down together with the Power Button. I don’t know why. Now, I tried to flash twrp in fastboot. Console said OK after 1.300s. But I can’t access twrp after this + bootloop (but I think bootloop is normal, because of the Sony image) --> flash twrp again --> the same. Flash .200 rom with Emma again + flash twrp recovery again --> the same situation. Flashing .575 Rom with Emma + flashing revovery, the same, too. Now I flashed Cyanogenmod 12.1, ran perfectly. I tried to flash twrp in fastboot again. I think, there was no Bootloop after flashing, but also no access to twrp recovery. Phone restart at boot process, while I tried to access recovery.
The good news: After I gave up, I flashed the device one last time with Emma, than I flashed the phone using flashtool on Sony Android Nougat Preview 4 (just to get any other Bootloader). Now, I flashed the good old Android 4.4 (23.0.A.2.93) with flashtool --> Giefroot --> Looked into *#*#7378423#*#* for the right Bootloader --> restore TA Partition. Now, I’m back on my rooted official Android 6.01 with Locked Bootloader.!
Bootloader after flashing .200 with Emma was S1_Boot_MSM8974AC_LA3.0_L_37
I'm sure, I did anything wrong. Would just like to know what.