This is a modified version of ZHA - Philips Hue Dimmer Switch (RWL020, RWL021) from https://community.home-assistant.io/t/zha-philips-hue-dimmer-switch-rwl020-rwl021/255048

ZHA - Philips Hue Dimmer Switch (RWL020, RWL021) - old firmware.yaml

blueprint:
  name: ZHA - Philips Hue Dimmer Switch - old firmware
  description: 'Control lights with a Philips Hue Dimmer Switch.


    The top "on" button will turn the lights on to the last set brightness

    (unless the force brightness is toggled on in the blueprint).


    Dim up/down buttons will change the brightness smoothly and can be pressed

    and hold until the brightness is satisfactory.


    The bottom "off" button will turn the lights off.

    '
  domain: automation
  input:
    remote:
      name: Philips Hue Dimmer Switch
      description: Pick either RWL020 (US) or RWL021 (EU)
      selector:
        device:
          integration: zha
          manufacturer: Philips
          entity:
            domain: sensor
            device_class: battery

    light:
      name: Light(s)
      description: The light(s) to control
      selector:
        target:
          entity:
            domain: light
    force_brightness:
      name: Force turn on brightness
      description:
        'Force the brightness to the set level below, when the "on" button
        on the remote is pushed and lights turn on.

        '
      default: false
      selector:
        boolean: {}
    brightness:
      name: Brightness
      description: Brightness of the light(s) when turning on
      default: 100
      selector:
        number:
          min: 0.0
          max: 100.0
          mode: slider
          step: 1.0
          unit_of_measurement: "%"
  source_url: https://gist.github.com/genebean/091b3459fbae43c29d3749e0c2d793d9
mode: restart
max_exceeded: silent
variables:
  force_brightness: !input "force_brightness"
trigger:
  - platform: event
    event_type: zha_event
    event_data:
      device_id: !input "remote"
action:
  - variables:
      command: "{{ trigger.event.data.command }}"
  - choose:
      - conditions:
          - "{{ command == 'on_press' }}"
        sequence:
          - choose:
              - conditions: "{{ force_brightness }}"
                sequence:
                  - service: light.turn_on
                    target: !input "light"
                    data:
                      transition: 1
                      brightness_pct: !input "brightness"
            default:
              - service: light.turn_on
                target: !input "light"
                data:
                  transition: 1
      - conditions:
          - "{{ command == 'off_press' }}"
        sequence:
          - service: light.turn_off
            target: !input "light"
            data:
              transition: 1
      - conditions:
          - "{{ command == 'up_press' }}"
        sequence:
          - service: light.turn_on
            target: !input "light"
            data:
              brightness_step_pct: 10
              transition: 1
      - conditions:
          - "{{ command == 'down_press' }}"
        sequence:
          - service: light.turn_on
            target: !input "light"
            data:
              brightness_step_pct: -10
              transition: 1