Nakasi - dead for good ?

Hello people,

I think, I've killed my nexus7 nakasi - 16GB model for ever today. Could you please help me try to resurrect it, or did I really kill him ?
Before, I was using unlocked, SuperSU rooted, KK 4.4.4 with TWRP bootloader and disabled some services (to stop stupid ota notifications coming up).
Today I wanted to try 5.1.1 (LMY47V), so I downloaded the ota, unzipped it, loaded adb, reboot into bootloader and ran flash-all.bat, as usually (I have already done it coulpe times before and never had any problems), until now.
Everything was running fine, until rebooting into bootloader ... ok.. waiting for device. The command line has stuck, so I removed table, terminated job, and tried booting bootloader by volume- & power. Nothing.

Please find my log output below.

Code:

---

D:\temp\adb>adb reboot bootloader

D:\temp\adb>flash-all.bat
...
(bootloader) Bootloader is already unlocked
OKAY [  0.022s]
finished. total time: 0.022s
erasing 'boot'...
OKAY [  0.033s]
finished. total time: 0.036s
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [  0.266s]
finished. total time: 0.270s
erasing 'recovery'...
OKAY [  0.036s]
finished. total time: 0.039s
******** Did you mean to fastboot format this partition?
erasing 'system'...
OKAY [  0.319s]
finished. total time: 0.322s
******** Did you mean to fastboot format this partition?
erasing 'userdata'...
OKAY [  8.775s]
finished. total time: 8.778s
sending 'bootloader' (2100 KB)...
OKAY [  0.268s]
writing 'bootloader'...
OKAY [  1.249s]
finished. total time: 1.524s
rebooting into bootloader...
OKAY [  0.020s]
finished. total time: 0.020s
< waiting for device >
^CTerminate batch job (Y/N)? y

---

Is there anything I can do to revive him ? Or is he dead now ?
I have tried:

• VOL+ VOL- POWER
  VOL- POWER
  Disconnecting battery + combination of previous before & after battery removal
  Connecting power + combination of previous before & after battery removal

When i connect it to my pc now, I can hear sound of new device connected - in APX mode.
Holding POWR VOL+ VOL- for 15 sec, causes tablet to disconnect and connect again in APX, but bootloader won't start.
Plugging it on charger does nothing, battery indicator doesn't show up.

Please help !