@tomas_hora I installed a clean OS from UniPi website and everything works.

Ad 1) Yes
Ad 2) No

I installed EVOK by apt-get, but I don't see any inputs and outputs in the web interface.
When I start EVOK manually, the output is ...

[I 190527 12:03:10 config:63] eprom: UniPi Neuron L513 version: 1.0 serial: 0x2d
[I 190527 12:03:10 evok:1664] Starting using config file /etc/evok.conf
[I 190527 12:03:11 config:94] YAML Definition loaded: /etc/hw_definitions/BuiltIn/L513.yaml, type: UniPiBuiltIn
[I 190527 12:03:11 config:87] YAML Definition loaded: xS30.yaml, type: 3, definition count 0
[I 190527 12:03:11 config:87] YAML Definition loaded: PRO1.yaml, type: 3, definition count 1
[I 190527 12:03:11 config:87] YAML Definition loaded: xS40.yaml, type: 3, definition count 2
[I 190527 12:03:11 config:87] YAML Definition loaded: xS50.yaml, type: 3, definition count 3
[I 190527 12:03:11 config:87] YAML Definition loaded: CUSTOM MODBUS DEVICE.yaml, type: 3, definition count 4
[I 190527 12:03:11 config:87] YAML Definition loaded: xS10.yaml, type: 3, definition count 5
[I 190527 12:03:11 config:87] YAML Definition loaded: evok-alias.yaml, type: 2, definition count 0
[I 190527 12:03:11 evok:1731] HTTP server listening on port: 8080
[I 190527 12:03:11 modbusclient_tornado:128] SPI client started
[I 190527 12:03:11 neuron:215] Reading SPI boards
[I 190527 12:03:11 neuron:230] No board on SPI 1
[I 190527 12:03:11 neuron:230] No board on SPI 2
[D 190527 12:03:11 owclient:377] Entering 1wire loop
[I 190527 12:03:11 neuron:230] No board on SPI 3
[E 190527 12:03:11 config:384] Invalid device circuit number 1_01
    Traceback (most recent call last):
      File "/opt/evok/config.py", line 379, in add_aliases
        dev_obj = Devices.by_int(dev_pointer["dev_type"], dev_pointer["circuit"])
      File "/opt/evok/devices.py", line 67, in by_int
        raise Exception('Invalid device circuit number %s' % str(circuit))
    Exception: Invalid device circuit number 1_01
[E 190527 12:03:11 config:384] Invalid device circuit number 1_02
    Traceback (most recent call last):
      File "/opt/evok/config.py", line 379, in add_aliases
        dev_obj = Devices.by_int(dev_pointer["dev_type"], dev_pointer["circuit"])
      File "/opt/evok/devices.py", line 67, in by_int
        raise Exception('Invalid device circuit number %s' % str(circuit))
    Exception: Invalid device circuit number 1_02
[I 190527 12:03:11 web:2064] 101 GET /ws (127.0.0.1) 3.45ms

Where is the problem?

Hello @martin-kudláček,
I made update, but problem with set pwm duty still exist. I have same problem if i use websocket API.

How can I set PWM duty to 0% on UniPi Neuron L513?
I tried to set via EVOK webpage but value didn't change. Minimal accept value is 1% :(
Thank you!