Hi Rokas Kucevicius,
Welcome to Microsoft Community.
Thanks for sharing the idea related to ChildCompletion.
We have observed some cases based on the "ChildCompletion" idea and found that in most of the cases, it works.
- In some cases, the boot mode (LEGACY or UEFI) or hard disk mode (AHCI or IDE) in the BIOS may have an effect.
- In addition, there is perhaps the possibility of system image failure or influence from other special partitions. Some models of devices may come pre-configured with a hidden partition. How to recover preloaded Windows by using OneKey Recovery - ideapad, Lenovo Laptops - Lenovo Support MO Lenovo Digital Download Recovery Service (DDRS) - Download the files needed to create a Lenovo USB Recovery key - Lenovo Support US
If you plan to completely clean up your Windows, you can contact an offline support store to assist you in checking the partitions in your device and completing the formatting process of your device.
| Disclaimer*: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.*<br>If you are going to modify BIOS Settings, please back up all your personal files first to ensure you do not lose data. |
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If I misunderstand your situation, feel free to correct me and share the information.
Best Regards,
Kyo - MSFT | Microsoft Community Technical Support