yes, this:
pacman -Sy linux66
instead of mhwd-kernel -i ...
which for reasons I do not know doesn’t work in chroot.
1 Like
Ok done - here is the whole output
:: Retrieving packages...
linux66-6.6.80-1-x86_64 129.7 MiB 17.5 MiB/s 00:07 [######################################################] 100%
(1/1) checking keys in keyring [######################################################] 100%
(1/1) checking package integrity [######################################################] 100%
(1/1) loading package files [######################################################] 100%
(1/1) checking for file conflicts [######################################################] 100%
(1/1) checking available disk space [######################################################] 100%
:: Processing package changes...
(1/1) installing linux66 [######################################################] 100%
Optional dependencies for linux66
wireless-regdb: to set the correct wireless channels of your country [installed]
:: Running post-transaction hooks...
(1/4) Arming ConditionNeedsUpdate...
(2/4) Updating module dependencies...
(3/4) Updating linux initcpios...
==> Building image from preset: /etc/mkinitcpio.d/linux66.preset: 'default'
==> Using default configuration file: '/etc/mkinitcpio.conf'
-> -k /boot/vmlinuz-6.6-x86_64 -g /boot/initramfs-6.6-x86_64.img
==> Starting build: '6.6.80-1-MANJARO'
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [autodetect]
-> Running build hook: [modconf]
-> Running build hook: [kms]
-> Running build hook: [block]
==> WARNING: Possibly missing firmware for module: 'xhci_pci'
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
-> Running build hook: [consolefont]
==> WARNING: consolefont: no font found in configuration
-> Running build hook: [plymouth]
-> Running build hook: [resume]
-> Running build hook: [filesystems]
-> Running build hook: [fsck]
==> Generating module dependencies
==> Creating zstd-compressed initcpio image: '/boot/initramfs-6.6-x86_64.img'
-> Early uncompressed CPIO image generation successful
==> Initcpio image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux66.preset: 'fallback'
==> Using default configuration file: '/etc/mkinitcpio.conf'
-> -k /boot/vmlinuz-6.6-x86_64 -g /boot/initramfs-6.6-x86_64-fallback.img -S autodetect
==> Starting build: '6.6.80-1-MANJARO'
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [modconf]
-> Running build hook: [kms]
==> WARNING: Possibly missing firmware for module: 'ast'
-> Running build hook: [block]
==> WARNING: Possibly missing firmware for module: 'aic94xx'
==> WARNING: Possibly missing firmware for module: 'qla1280'
==> WARNING: Possibly missing firmware for module: 'qed'
==> WARNING: Possibly missing firmware for module: 'wd719x'
==> WARNING: Possibly missing firmware for module: 'bfa'
==> WARNING: Possibly missing firmware for module: 'qla2xxx'
==> WARNING: Possibly missing firmware for module: 'xhci_pci'
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
-> Running build hook: [consolefont]
==> WARNING: consolefont: no font found in configuration
-> Running build hook: [plymouth]
-> Running build hook: [resume]
-> Running build hook: [filesystems]
-> Running build hook: [fsck]
==> Generating module dependencies
==> Creating zstd-compressed initcpio image: '/boot/initramfs-6.6-x86_64-fallback.img'
-> Early uncompressed CPIO image generation successful
==> Initcpio image generation successful
(4/4) Updating Grub-Bootmenu
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-6.6-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-6.6-x86_64.img
Found initrd fallback image: /boot/initramfs-6.6-x86_64-fallback.img
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Adding boot menu entry for UEFI Firmware Settings ...
Root filesystem isn't btrfs
If you think an error has occurred, please file a bug report at "https://github.com/Antynea/grub-btrfs"
Found memtest86+ image: /boot/memtest86+/memtest.bin
/usr/bin/grub-probe: warning: unknown device type nvme0n1.
Found memtest86+ EFI image: /boot/memtest86+/memtest.efi
/usr/bin/grub-probe: warning: unknown device type nvme0n1.
done
Ohh my, it left something for me in the /boot folder.
[manjaro /]# ls -l /boot
total 118360
drwxr-xr-x 3 root root 4096 Jan 1 1970 efi
drwxr-xr-x 6 root root 4096 Mar 8 14:45 grub
-rw------- 1 root root 78069561 Mar 8 14:45 initramfs-6.6-x86_64-fallback.img
-rw------- 1 root root 20389392 Mar 8 14:45 initramfs-6.6-x86_64.img
-rw-r--r-- 1 root root 9683968 Feb 11 18:09 intel-ucode.img
-rw-r--r-- 1 root root 21 Feb 27 14:05 linux66-x86_64.kver
drwxr-xr-x 2 root root 4096 Mar 5 17:47 memtest86+
-rw-r--r-- 1 root root 13029888 Mar 8 14:45 vmlinuz-6.6-x86_64
Those warnings are typically nothing to be concerned with.
If you can now boot then 
Regards.
1 Like
Let the boot commence. Se you guys on the other side! 
Not so fast!
Reboot first, and then;
It’s usually required that you mark the post that helped you the most as the solution.
(I note @megavolt has put some effort into this topic.)
After that, you can sail off into the sunset.
1 Like
I’m back! Now on a perfectly running system. Thank you guys - you saved my day 
I’ve marked @megavolt reply as the solution, but thank you all for the swift replies!
Ok - recap for others that might end up here
1: After update the system would not boot
2: Made a LiveUSB by downloading a Manjaro ISO
3: Used Ventoy instead of Rufus to transfer ISO to bootable USB
4: Installed a new kernel using pacman -Sy linux66
5: This fixed everything - even the grumpy Grub
Thanks a million, sailing off into the sunset 
3 Likes
See you again at some fine sunrise.
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