Initial WireGuard support has been merged but I regard it as an experimental feature. It's merged to LE master branch, also to LE 9.2 branch as more people are likely to use it there and thus more issues will be discovered. I will need to bump connman and the wireguard module/tools packages before we release LE 9.2.1 (no schedule).
There is no wg-quick or wg0.conf due to the embedded packaging of LE - read Creating WireGuard Keys [LibreELEC.wiki] to understand how it's implemented.
Most nVidia GPUs suffer from under-development on closed-source VDPAU so even if the card is vastly superior in mathematical compute capabilities it may not necessarily be any better than the Intel GPU which is still capable of hardware accelerating the same range of media. Kodi is not a complex OpenGL app, so it doesn't really need or benefit from high-end GPUs.
macOS stuff is the main hold-up as I understand it ..
Three suggestions that might work:
a) Enable "legacy boot" in BIOS settings which should disable EFI boot.
b) Boot from any other Linux distro USB and run "dd if=/path/to/LibreELEC-Generic.x86_64-9.0.2.img of=/dev/sda bs=1M" (checking the disk you want to write to is /dev/sda .. and noting the image is uncompressed to .img not .img.gz). This writes the USB image to the HDD, and in theory this should boot, time out the same way, but this time it self-installs to the HDD not the USB so you end up with a working install.
c) Remove the HDD and put it in a USB caddy to write the image to the HDD .. different way to the same result as B.
A is easier than B which is marginally more complex but requires no extra hardware like C
RPi4 haardware is capable of HDR but LE (and all other RPi distros) have no "software" support for HDR at the current time. It's still being worked on and might part of the future LE10 (Kodi v19) release if things keep going at the current rate of progress. No promises though.
It's sounds like the device is EFI booting and ends up following the "run" configuration (not sure how or why.. that's the only explanation). I've observed that EFI support tends to get worse the older machines are .. maybe that's the reason.
Anyway .. what happens when you type "installer" instead of leaving it alone?
I haven't used Amlogic BSP kernel images on anything since ~November 2018 so I have no idea, sorry.
Kodi outputs progressive and interlaced media output is faked, e.g. 1080i@25 (typical PAL content) will be output as 1080p@50 (one interlaced frame per refresh, so double the number of interlaced frames). This means even if it can see 1080i in the list, it will choose 720p as the desktop resolution. I forget how things have evolved over Kodi releases, but IIRC this has been the behaviour for some time but older releases wrongly reported things so people believe they were using 1080i desktop in the past when they weren't.
It should be in Kodi v18.6 when that ships (no ETA at the moment).
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The commit message is misleadingly worded. VP9 and HEVC share some common pluming which is provided by that commiit. In the same series you also have the full VP9 decoder. HEVC is still missing from the line-up. We are now in the odd situation of having the firmware that was missing a few months ago, but now the driver is absent. Previous patches that added HEVC support are not aligned to the updated firmware and recent compliance changes in APIs .. so rework is needed. Google (who is funding most of the current development) cares most about H264 and VP9 so those are being done first (annoyingly).
Kodi sucks a bit at presenting games, there is still no database to store the configuration needed for a specific game rom. In short, Emulators are just background plumbing and are not the thing you navigate from. You need to start from a game rom, then you're prompted for the Emulator to use with that rom. Then the game launches. This is where add-ons like "Internet Archive Game Launcher" are useful, because they create the searchable front-end interface to navigate from. The only games that will show up under "Home > Games" are games that are natively compiled to run on the host platorm (no emulator involved) e.g. 2048 and the Bomberman clone in our game repo.
mkdir -p /storage/.config/firmware/mediatek
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/mediatek/mt7610u.bin -O /storage/.config/firmware/mediatek/mt7610u.bin
reboot^ run those commands (mind the line-wrap on wget) .. working?
"GUI at 1080p" means leave (or set) the default resolution to 1080p.
If the phone ends up with a link-local address (169.x.x.x) the iPhone will not see the connection as routable so data continues to work as normal. The hotspot feature in ConnMan (the connection manager) only allows you to set on/off and ssid/passphrase though (same as the phone hotspot which is what the feature was designed for) .. so it's not possible to set/control that.
In theory if you share a hotspot from the phone you achieve the same thing (RPi and Phone have an IP connection) but the phone remains the internet connected device. I've never tested to see whether the Phone can see the Kodi Airplay target in this mode though. Go see if that works?
To do it the lazy but more risk-prone way, you need to SSH in and run three commands:
touch /storage/.update/.nocompat
wget http://releases.libreelec.tv/LibreELEC-RPi4.arm-9.2.0.tar
rebootThis will disable the compat check (else we detect RPi4 is the wrong image for your RPi2(3) device and abort update) and then we download the RPi4 image and reboot. On reboot it will update to the RPi4 image. On reboot after updating it should fail to boot. You can now power off the RPi3 and move the SD card to the RPi4, which should boot. Remove any overclock/tuning etc. from config.txt before booting the RPi4 - it's not necessary.
If you want to play safe, make a backup first, then you can always clean install the RPi4 and restore the previous configuration.
LE settings will configure the embedded Samba "server" and Kodi settings configures the Samba "client" (smbclient). Both include the word "Samba" but are otherwise completetly unrelated.