Yes, the Logitech Harmony 650 remote should map without any issues using an Flirc on your Raspberry Pi devices running LibreELEC.

Here are some general tips for setting up and configuring the remote:

1. Connect the USB cable from the Flirc to one of your RPi2/3 media device's USB ports.

2. Plug in a compatible infrared (IR) blaster into another IR port on the same TV as where you've connected it, then plug this other end into an available HDMI 1-4 port depending NavParams for which specific model TV models work best because there are many different types out there!

3. Download and install any necessary drivers or software from the official Flirc website onto your computer before proceeding further since they provide a comprehensive guide on how to use their product properly after installation is complete.

Once everything has been connected correctly according to these instructions above (which should take about 5-10 minutes depending upon individual comfort levels), follow along with this step-by-step tutorial below:

1. Boot up the Raspberry Pi device you want to map your Harmony remote too.

2. Launch Kodi or whatever media player software comes pre-installed on your RPi running LibreELEC.

3. Go into 'Settings' > 'System Information'.

4. Scroll down until you see an option labeled as 'Input Devices'. Clicking this will bring up a list showing all connected input devices currently recognized by the system, including our newly paired Logitech Harmony 650 remote.

Now we need to map each button on the Harmony controller to its corresponding function within Kodi:

1. In your web browser, navigate over here: http://192.168.x.yyy:8090 (replace 'x', 'y' & zzz with IP address shown under 'Device Name' in step 4 above).

2. Clicking anywhere inside any of the large empty squares should open up a pop-up window asking whether you'd like to assign this particular key press action when pressed down simultaneously while holding another specific button(s) at once - let's call them Macro A & B respectively.

For example, if we want pressing both 'Vol-', Up arrow keys together results in lowering volume by 5% and then skipping forward one track using standard remote controls terminology; first select the correct device from dropdown menus provided under 'Device Name' field before proceeding further down page until reaching section titled 'Mappings'.

Here you'll see several rows representing different types of mappings available such as Media Player Controls, TV Functions etc. Since we're interested only in mapping our Harmony's button layout onto existing Kodi hotkeys without creating new ones altogether; click on the first row labeled 'Media Player Controls'.

In this window, find and select each individual keypress action you want to associate with a particular physical button press event from your Logitech remote control - e.g., volume up/down buttons correspondingly map directly onto Volume Up/Down hotkeys within Kodi. Repeat process until all desired mappings have been established across entire row.

Once complete save changes by clicking 'Save All' at bottom right corner of the screen to apply these newly created remappings system-wide instantly without needing a restart or rebooting device again!

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