PW3 Bricked/Needs repair PW3

Hello.
I received a PW3 Kindle which was stuck on the tree loading screen, so i've started searching and reading how to bring it back to live.. I read a lot of tuts, tried most of them, didn't try the one with "Create an empty file in the root directory DO_FACTORY_RESTORE." because I saw it too late..

What I have tried...
-download few versions of update*.bin file from amazon site
-connected pw3 via serial usb to PC and from factory menu chose E(export FAT), placed the file and then option Update from fat.. result was error:4
and after the fail, when leave it to boot kindle says:
before the update to fail it was trying to load..after the fail... just the tree :D

after that...
- downloaded kindletool, extracted update*.bin, took uImage file and flash it
terminal window with fastboot says OKEY to read and write, but the terminal with serial connection to Kindle says:
in one of the treads was written to flash diags_kernel , not just kernel... the respond was the same..

Till this point I had access to FAT partition, but in some point I got mad that nothing happens after so much tries and reading..sooo I got into recovery and chose Erase MMC0 :stupid::smack: Thought I'll do like other..Erase All and tuts could work, but...while it was erasing..it got stuck and now it says Kindle need repair, no storage visible to copy *.bin file..just serial connection, uboot, bist and recovery.

And this is the output if leaved to boot:
In some point kindle said "wiki: j5_rootfs_repartitioning"

Is there any chance of fixing it, except contacting Amazon?