nsa325 v1 is bricked or dead. Serial and kwboot didn't work (no replies)

Hi.

I've got NSA235 v1 NAS from my friend. He didn't remember is it worked at all.

When I plug a power cord the NAS turns on HDD2 and power LEDs and starts spinning the cooler. But in 20-30 seconds power LED blinks and cooler stops spinning and then starts again.

I did my homework and read various topics regarding NSA325 unbricking. I tried to connect via serial console (I have prolific PL2303 USB adapter and the FTDI FT232RL one).

I downloaded uboot image and tried to load it.

kwboot  -t -B 115200 /dev/ttyUSB0 -b uboot.2017.07-tld-1.nsa325.mtd0.kwb  -p

But no success - it shows only that:

Sending boot message. Please reboot the target.../

And never stops spinning.

Is anything can be done or NAS is completely dead?