thanks for the clear instructions. see attached for the logfile of the keypresses.
I regularly double checked while annotating, and had to insert 1 key (hence a shifted timestamp).
Also, 2 rows didn't emit any signal (double checked with the camera on my phone), this was the 3rd row (with arrows up/down/left/right), and the first row of the numeric keypad (1/2/3).
I'm pretty sure they never worked... (Edit: My kid said nr3 sometimes works after pressing lot's of other numbers, I tried shaking/pressing, and indeed I've seen some response from the device, guess I'll need to open up the remote and clean some silicone juice)
ir-keycodes.log
About the LED:
In Libre/CoreELEC I only ever saw the blue light while powered on, off after shutdown.
I just booted the internal android: Blue while 'On', Red while in 'Standby', Purple for a short moment while transitioning from 'Stanby to On'
Probably you're correct about the BT, cannot find it either, but I remember now I once powered an edison-board from the usb-port of this player as a BT-gateway, and I also used a wireless headset (BT+RF), but I indeed plugged the USB-RF into the player.
So probably I was wrong assuming their was BT inside...
Does this IR-keymap also impact the keyboard?
Do you recommend LibreELEC of CoreELEC? for this device? (CE19 seems to get stuck in a freeze/reboot loop, CE20 with a 'slowemmc' does seem to keep running because the ping remains stable, but I cannot get any screen on it - tried on 720p TV, and 1440p 21:9 monitor, so I cannot get it configured)