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I have installed Gentoo kernel 4.14.y from https://github.com/raspberrypi/linux. dmesg shows the following errors

...
...
[    0.182547] dmi: Firmware registration failed.
...
...
[    2.224843] mmc1: error -110 whilst initialising SDIO card
[    2.270109] random: crng init done
[    3.483868] mmc1: error -110 whilst initialising SDIO card
[    4.751858] mmc1: error -110 whilst initialising SDIO card
...
...
[    6.120869] mmc1: error -110 whilst initialising SDIO card
[    8.168627] cgroup: cgroup2: unknown option "nsdelegate"
[    8.631640] udevd[657]: starting version 3.2.5
[    8.688998] udevd[657]: specified group 'i2c' unknown
[    8.689131] udevd[657]: specified group 'spi' unknown
[    8.689254] udevd[657]: specified group 'gpio' unknown
...
...
[   15.996362] Bluetooth: HCI UART protocol Broadcom registered
[   18.018711] Bluetooth: hci0 command 0x0c03 tx timeout
[   20.956254] NET: Registered protocol family 10
[   20.958169] Segment Routing with IPv6
[   26.082743] Bluetooth: hci0: BCM: Reset failed (-110)

How can I fix them and update to the latest stable kernel?

--progress--

specified group *** unknown in solved by groupadd ***

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I don't know what distribution you are using but with Raspbian you get the latest stable kernel from its repository. You have to ensure that the sources.list contains the right repositories:

rpi ~$ cat /etc/apt/sources.list
deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi

rpi ~$ cat /etc/apt/sources.list.d/raspi.list
deb http://archive.raspberrypi.org/debian/ stretch main ui
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://archive.raspberrypi.org/debian/ stretch main ui

Then do:

rpi ~$ sudo apt update
rpi ~$ sudo apt full-upgrade

Then you will have the latest stable kernel that also fits to the loadable modules and overlays. You should not get any error messages about this, assumed you are using Raspbian.

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