Bricked Device, Black Screen, No Boot Logo, Nothing happens L-21

Hello,
after i followed this steps below.
http://forum.xda-developers.com/show...postcount=1686

After that i was able to boot "normally" with CM 13 version from 2016-07-19
I did a full wipe because of some force close.
Everything was running nice, i enabled the finger print.

This morning i installed 2016-07-20. (dirty flash)
after wiping dalvik screen turns black.

i already tried:

1. turn off your phone


2. put USB-cable in your computer (with drivers and fastboot installed)


3. press power + vol down and plug in USB-cable in your phone within 1 second


4. then you should be in fastboot mode (bootloader)


5. then you can flash twrp instead of stock recovery


6. then you can flash a rom or restore a backup


7. now you're not back at stock but don't have a brick

I am not sure if my phone is turned off.
I also tried to hold power for 10 seconds, 15 seconds 1 minute, longer
I got an usb amperemeter, it tells me, that the phone is charing with 0,09-0,24 A, while the screen is black

fastboot devices dont show a device
adb devices dont show a device


any ideas or suggestions? thanks in advance