After the traditional weekly update, the system stopped booting from the LTS kernel. With the current kernel, the launch is error-free. Reinstalled linux-lts and linux-lts-headers - nothing has changed.
What could it be?
P.S. My wife’s computer, with exactly the same configuration and the same software version, starts with the LTS kernel without problems after the update… 
Which bootmanager you have? systemd-boot?
Default installations with GRUB as a bootloader.
can you boot on USB iso endaevouros ,
chroot and check in journal log ?
journalctl -b -1 I am on a system with the current kernel, there is no need to boot from USB. What exactly should I look for in the log?
Do I understand correctly that I need to reproduce the error and then look at the log?
What exactly do you mean wiht “stopped booting”? What is the error message? How far does the boot process go?
Which LTS kernel version? kernel 6.6.70 received an update to 6.6.71 already.
You say your kernel boots fine with “current kernel”. Then you have a running system and can try to downgrade the lts kernel and see if that helps.
sudo downgrade linux-lts linux-lts-headers
When you have a runnig system with the current kernel, do you have a log from the failed boot with LTS?
Rolled back to LTS version 6.6.69 - it still won’t load 
It shows me like this
can you provide
inxi -Fza[vladimir@vladimir-mini ~]$ inxi -Fza
System:
Kernel: 6.12.9-arch1-1 arch: x86_64 bits: 64 compiler: gcc v: 14.2.1
clocksource: tsc avail: acpi_pm parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux
root=UUID=583f6764-056b-4e5a-9f78-ce6d705e8fad rw rootflags=subvol=@
nowatchdog nvme_load=YES resume=UUID=da81c256-5b2e-4077-a916-3a3f424f5f20
loglevel=3
Desktop: KDE Plasma v: 6.2.5 tk: Qt v: N/A info: frameworks v: 6.10.0
wm: kwin_wayland with: krunner vt: 1 dm: SDDM Distro: EndeavourOS
base: Arch Linux
Machine:
Type: Desktop Mobo: AZW model: EQ MINI v: 10 serial: <superuser required>
part-nu: 01 uuid: <superuser required> UEFI: American Megatrends LLC.
v: ADLNV104 date: 04/19/2023
CPU:
Info: model: Intel N100 bits: 64 type: MCP arch: Alder Lake level: v3
note: check built: 2021+ process: Intel 7 (10nm ESF) family: 6
model-id: 0xBE (190) stepping: 0 microcode: 0x1A
Topology: cpus: 1x dies: 1 clusters: 1 cores: 4 smt: <unsupported> cache:
L1: 384 KiB desc: d-4x32 KiB; i-4x64 KiB L2: 2 MiB desc: 1x2 MiB L3: 6 MiB
desc: 1x6 MiB
Speed (MHz): avg: 700 min/max: 700/3400 scaling: driver: intel_pstate
governor: powersave cores: 1: 700 2: 700 3: 700 4: 700 bogomips: 6452
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Vulnerabilities:
Type: gather_data_sampling status: Not affected
Type: itlb_multihit status: Not affected
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: mmio_stale_data status: Not affected
Type: reg_file_data_sampling mitigation: Clear Register File
Type: retbleed status: Not affected
Type: spec_rstack_overflow status: Not affected
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
prctl
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
sanitization
Type: spectre_v2 mitigation: Enhanced / Automatic IBRS; IBPB:
conditional; RSB filling; PBRSB-eIBRS: Not affected; BHI: BHI_DIS_S
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: Intel Alder Lake-N [UHD Graphics] driver: i915 v: kernel
alternate: xe arch: Gen-12.1 process: Intel 10nm built: 2020-21 ports:
active: HDMI-A-1 empty: HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:46d1
class-ID: 0300
Display: wayland server: X.org v: 1.21.1.15 with: Xwayland v: 24.1.4
compositor: kwin_wayland driver: X: loaded: modesetting
alternate: fbdev,intel,vesa dri: iris gpu: i915 display-ID: 0
Monitor-1: HDMI-A-1 res: 1920x1080 size: N/A modes: N/A
API: EGL v: 1.5 hw: drv: intel iris platforms: device: 0 drv: iris
device: 1 drv: swrast gbm: drv: iris surfaceless: drv: iris wayland:
drv: iris x11: drv: iris
API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 24.3.3-arch1.1
glx-v: 1.4 direct-render: yes renderer: Mesa Intel Graphics (ADL-N)
device-ID: 8086:46d1 memory: 7.52 GiB unified: yes display-ID: :1.0
API: Vulkan Message: No Vulkan data available.
Audio:
Device-1: Intel Alder Lake-N PCH High Definition Audio driver: snd_hda_intel
v: kernel alternate: snd_soc_avs,snd_sof_pci_intel_tgl bus-ID: 00:1f.3
chip-ID: 8086:54c8 class-ID: 0403
API: ALSA v: k6.12.9-arch1-1 status: kernel-api
tools: alsactl,alsamixer,amixer
Server-1: PipeWire v: 1.2.7 status: active with: 1: pipewire-pulse
status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin
4: pw-jack type: plugin tools: pactl,pw-cat,pw-cli,wpctl
Network:
Device-1: Intel CNVi: Wi-Fi driver: iwlwifi v: kernel bus-ID: 00:14.3
chip-ID: 8086:54f0 class-ID: 0280
IF: wlan0 state: up mac: <filter>
Device-2: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
driver: r8169 v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 1 port: 3000
bus-ID: 01:00.0 chip-ID: 10ec:8168 class-ID: 0200
IF: enp1s0 state: down mac: <filter>
Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant
Bluetooth:
Device-1: Intel AX201 Bluetooth driver: btusb v: 0.8 type: USB rev: 2.0
speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 1-10:3 chip-ID: 8087:0026
class-ID: e001
Report: btmgmt ID: hci0 rfk-id: 0 state: down bt-service: disabled
rfk-block: hardware: no software: no address: N/A
Drives:
Local Storage: total: 476.94 GiB used: 168.09 GiB (35.2%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 model: 512GB SSD size: 476.94 GiB
block-size: physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4
tech: SSD serial: <filter> fw-rev: V0808A0 temp: 51.9 C scheme: GPT
Partition:
ID-1: / raw-size: 459.01 GiB size: 459.01 GiB (100.00%)
used: 168.09 GiB (36.6%) fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
ID-2: /boot/efi raw-size: 1000 MiB size: 998 MiB (99.80%)
used: 588 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1
ID-3: /home raw-size: 459.01 GiB size: 459.01 GiB (100.00%)
used: 168.09 GiB (36.6%) fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
ID-4: /var/log raw-size: 459.01 GiB size: 459.01 GiB (100.00%)
used: 168.09 GiB (36.6%) fs: btrfs dev: /dev/nvme0n1p2 maj-min: 259:2
Swap:
Kernel: swappiness: 60 (default) cache-pressure: 100 (default) zswap: no
ID-1: swap-1 type: partition size: 16.94 GiB used: 0 KiB (0.0%)
priority: -2 dev: /dev/nvme0n1p3 maj-min: 259:3
Sensors:
System Temperatures: cpu: 53.0 C mobo: N/A
Fan Speeds (rpm): N/A
Info:
Memory: total: 16 GiB note: est. available: 15.4 GiB used: 5.48 GiB (35.6%)
Processes: 247 Power: uptime: 43m states: freeze,mem,disk suspend: deep
avail: s2idle wakeups: 0 hibernate: platform avail: shutdown, reboot,
suspend, test_resume image: 6.15 GiB services: org_kde_powerdevil,
power-profiles-daemon, upowerd Init: systemd v: 257 default: graphical
tool: systemctl
Packages: pm: pacman pkgs: 1368 libs: 351 tools: pacseek,yay Compilers:
gcc: 14.2.1 Shell: Bash v: 5.2.37 running-in: konsole inxi: 3.3.36
Please format the ouput. Preformatted text (Cntrl-e)
Done
The issue has been resolved 
Thank you all!
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