Windows 11 stuck on an infinite boot loop after interruped upgrade from windows 10

Hi,

a colleague ran the upgrade to win 11 on a laptop with a working win 10 system, but he did not take care of the power connection and the battery ran out during the upgrade (after restarting the system).

I would like to ask for help, as all the ideas I could find did not work. Is it possible to fix the problem at all?

the problem looks like this: at startup, the computer displays for a moment (2-3 Seconds) the message: "Update in progress. Don't turn off your computer", but after that the operating system does not load, but a restart is performed; Sometimes it shows a prompt for <0.5 Seconds to inform you about the progress of work, but I saw numbers of 35%, 38% and even 100%. Regardless it, the restart is performed continuously in an infinite loop.

I was only able to boot to Safe Mode with Networking, so it looks like windows 11 is properly installed. However, I still can't connect to the internet (I can see that it is not possible to connect in safe mode), so safe mode works in "minimal" mode even though it started "network" tryp

I prepared two bootable USB Flashesh: One from Windows 10, the other from Windows 11.

using the recovery system and the option to repair the computer on bootable usb flashes, I tried to repair the computer:

1. "startup repair" failed. After about 10 seconds, I see a prompt that startup repair was not possible and the logs have been saved in the file C: /Windows/System32/LogFiles/srt/SrtTrail.txt. I have checked this file and I can notice there that important file .cip is corrupted, like this: https://answers.microsoft.com/en-us/windows/forum/all/cefimicrosoftbootcipoliciesactivecip-is-corrupted/6f959bc0-7e59-4550-9e77-6d69ebd55530 d I checked that the file exists (on the system partition), but it is difficult for me to judge why it is not correct. The solution suggestions from https://answers.microsoft.com/en-us/windows/forum/all/cefimicrosoftbootcipoliciesactivecip-is-corrupted/6f959bc0-7e59-4550-9e77-6d69ebd55530 did not help.
2. "uninstall updates". failed too. The prompt says that no ostation updates were found, probably because the last update was a win 11 upgrade.
3. "system restore" failed too, because no restore point can be found.
4. "system image recovery" failed too, because not system image can be found. According to the instructions, you can add system image using a DVD, which, however, is not possible with this laptop due to the lack of a CD / DVD drive. Why can't USB Flash be used?

5 "command prompt" is available. Here I was able to change the bcdedit setting to boot into safe mode, however other ideas failed:

a) "Repair Boot Drive from Command Prompt" (https://www.easeus.com/partition-master/troubleshoot-windows-11-boot-loop.html) failed, because "bootrec.exe /fixboot" returns "access denied"

b) "Uninstall recent Windows updates" (https://windowsreport.com/windows-11-reboot-loop/ ) failde, because Settings -> Windows Update can not be opened in safe mode.

c) "Delete files in the Software Distribution folder" (https://windowsreport.com/windows-11-reboot-loop/ ): I deleted te directore C:\Windows\SoftwareDistribution, but i can't run commands "net stop wuauserv" and "net stop bits" because of error "the service name is invalid net helpmsg 2185"

d) "Run a quick SFC scan": (https://windowsreport.com/windows-11-reboot-loop/ ): The "sfc /scannow" shows, that there is no problems.

are there any other ways to fix the problem?

of course I know that the system can be reinstalled, but I only want to do it as a last resort. Can the same license key be used for a new installation? Can the same license key be used if I install windows on a different partition of the same disk?

And the last question: Unfortunately, the laptop manufacturer did not include the license key for purchase in the registry "HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ SoftwareProtectionPlatform" under the key "BackupProductKeyDefault". Is this a valid key? Can it be used to properly install the system or to install a second system on a different partition?

thank you in advance for your answer and help