Be more than happy to. I’ll explain once I’m home and have access to my box.
The IR power on code for the N2 can be set by following these instructions.
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Alrighty. So I have my CEC settings in CoreELEC (System -> Input -> Peripherals -> CEC Adapter) as such:
You’ll also have to make sure that CEC is enabled on your TV as well. Every manufacturer seems to call their bold interpretation of the CEC standard something different; Samsung calls theirs Anylink+, LG calls theirs Simplink, Panasonic calls theirs VieraLink, etc etc.
Instructions for programming the TV IR power code to your Air Mouse are usually included in the packaging. I’ve seen a couple versions of the instructions included with these remotes from different suppliers and depending on which one you get from Amazon, said instructions can be very poorly translated and damn near unusable. I’ve attached a PDF of the most useable instructions in case you find yourself in that boat.
Keymote.pdf (1.6 MB)
As I’m writing this I see Betatester posted a video covering the same thing so you have lots of options.
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I suspect interference is what’s causing you problems with all the remotes you’ve tried.
Try a different USB port for your extension cable, try without an extension cable at all.
Other than that check what other devices you have close by, and try to move the remote dongle away from interference sources.
One more option would be a flirc USB adapter, which allows one to use any remote with any TV Box having a functional USB port available.
As it happens frequently, there is more than one way to skin a cat: from checking for interference over injecting the BL301 blob to using a Universal IR Rremote or a flirc USB adapter.
The Mx3 control solved my issues.
It actually performs really well i am 4 meters back from projector and it responds exactly how it should. No delay or problems with going to fast etc. It has a clicking noise on purpose when you hit the arrow keys which is actually very useful. Overall 100 percent better than my other controls.
Thanks for the instructions, I will have a got at them later and let you know how I get on.
Using the coreelec cec settings above and program your remote video will that let me power off the device the same as going to coreelec shutdown with the remote?
I am confused alittle 
Thanks everybody for help.
Sim
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My suggestion would be to go from easy to hard. Start with teaching the MX remote the power on/off codes for the box and escalate from there till it works.
Thanks for letting us know this remote works perfectly fine with odroid.
I got the hardkernel IR remote, but the problem is it’s a bit sluggish with some skins and not exactly all that great. So I’m thinking about getting the controller you recommend but before that, I need to know one thing. I have my Odroid N2 hooked up via a Denon receiver through HDMI and I can control the volume on the receiver and not the software volume on the CoreELEC with this IR remote. Will this remote controller be able to do the same? That’s the only thing I have to know, I already got this in my cart, just word will decide if I should checkout. If it can, that’ll be awesome. Thanks in advance
I’ll be honest, I’m not entirely sure. I’ve got my N2 connected to the TV directly via HDMI and returning optical audio to my receiver as a way to bypass my trusty (but old) receivers inability to passthrough 4K HDR.
I feel like you should be able to but I can’t say for certain without playing around with my setup to try. @Betatester are you able to confirm based on your use case?
Oh okay, when I used to use yatse on Android, the volume controller on it controls the software volume, but it’s on wifi so I can’t confirm about the Bluetooth, it was helpful when I was using my old Yamaha receiver (20 years old, still awesome and still awesome, it’s amazing) don’t wanna spend more money without confirming anything you know. Already spent quite a bit with the eMMC, IR Remote, eMMC writer (shipping rates are rediculous). If anyone’s able to confirm this, would be so great.
Your reasoning is sound. I have done similar myself a many times successfully.
CE should automatically detect which output is wired to the receiver, but just in case it doesn’t: Setting/System/Audio/Audio output device, and just change it to whatever you want.
See Kodi Wiki
Cheers!
@travissolaman I’ll muck around with my setup this weekend if I have time and see if I can accomplish anything.
just throwing another suggestion out there.
I just started using this remote in place of my G20 (which would randomly just have buttons stop working on my N2). I was able to program the TV to the volume buttons, and then program the N2 with the xbox power button, so I’m able to turn everything (N2, TV, Receiver) on and off via CEC, and the TV volume is able to control the receiver via CEC.
Works very well IMO, even though everything is IR based.
Not sure what planet I was living on, but I just checked the volume button on my MX3 Air mouse and it controls the receiver volume just fine. No settings changed… My apologies, I was under the impression that it didn’t and proceeded to never use it, apparently…
Anyhow, there you have it.
Cheers.
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Oh no, very much appreciated, gonna order it right away, that’s all I wanted, hardkernel remote is very minimal, not a lot of buttons, good for an average user. But this mx3 air mouse looks very promising, got a lot of buttons and the keyboard. Just wanted to know about the AV receiver controls. Thank you very much for confirming this. Makes life a little easier lol.
I turn off n2 with the IR remote, but I turn on the tv the next day with the tv remote and everything turns on, so limitation of the Bluetooth not being able to wake it up is fine for me. Thank you for the suggestion, really appreciate it
Glad I could help, albeit in a roundabout kind of way. @Betatester you helped two of us today. 
Thanks!
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Just got it in the mail today, and right away started playing with. Boy oh boy, I am absolutely impressed with it. The 4 programmable IR buttons are amazing, made my life easier by a significant amount. It’s very fast and responsive and I love the light for the buttons. Thank so much for recommending this one. I highly recommend this remote if anyone’s looking for one. Programmed the power button with my hardkernel remote and that’s sorted out. One less remote to worry about (AV reciever)
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A small issue, can’t really call it an issue. Is there any way to disable the sleep of the air mouse. When it’s idle it sleeps and it’s kinda annoying. Apart from that everything’s good. Don’t really care about it eating through battery