Is it possible to reanimate Sony z3v (D6708) after an unsuccessful firmware (only Fastboot is available)?

Question

Android

There was a problem. Sony z3 v , D6708.
By mistake, I flashed the wrong firmware in TWRP (from the usual Z3, without "v"). As a result:
- when the power button is pressed briefly, nothing happens
- when the power button is pressed for a long time - a brief vibration and again nothing happens
- the yellow reset button does not help
- when connected to a PC - the LED briefly turns red, short vibration, the LED turns on green; then it repeats cyclically
The only thing I can do is go into Fastboot mode. Flashtool sees it in this mode, but what to do next is not clear. When I run flashtool in Fastboot firmware mode, it gives me Fastboot Toolbox, from where I can flash system or kernel.
I renamed ftf to zip, extracted system.img and kernel.img, and tried flashing them via fastboot.
Kernel is not flashed, because bootloader is not unlocked, as far as I understand, it is impossible to unlock the bootloader in the current state of the device. System is also not flashed - says Flashing selected system, that's all.
Couldn't find an answer on w3bsit3-dns.com.
There was no answer to xda either, but someone wrote that after the same situation in some service, they still asked him for a phone - which means it's still possible. Who will tell you what can be done?

Answer 1

The main thing that comes into fastboot. Read about adb. You need to find the adb driver for your model.
As soon as you start working with the driver, be sure to first execute the "adb fastboot devices" command (something like this, this step will definitely be in the instructions). So you will understand:
1. Does the adb driver work
2. Does the driver see your smart.
Using adb, you can flash / throw the firmware into smart, as well as install twrp (all actions are performed on the command line, the system on the phone is not needed, access to fastboot is required).
I've already eaten my dog ​​on this one. There will be questions - write.

Answer 2

I did not find how to ask a question to the author of the post.
In the end, did you manage to resurrect the device?
Could put on it something better than the original 5.1.1?
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