Hi
Welcome to Microsoft community.
I understand that you are facing the issue of UEFI boot order changing after an update.
Typically, Windows updates do not change the UEFI boot order. It may be due to a firmware update on your motherboard after the update, which can reset the UEFI boot order to default. If you are using a dual-boot system, there may be changes in the boot order between the two systems. In this case, you can refer to the motherboard manual to manually change the UEFI boot order.
If you encounter more issues during the process, you can post your question on the Microsoft Learn forum, where more experts can help you with the issue. If you still have any thoughts on the current issue, you can provide feedback to the Microsoft team.
Microsoft attaches great importance to user experience, you can submit your ideas and suggestions through the Feedback Hub, and the development team will regularly review submissions for ideas or fixes.
Please share the feedback link here after submitting as it will allow others on the forum to vote for your submission, including me. More votes will lead to more visibility and higher priority to the development team.
Best regards
Derrick Qian | Microsoft Community Support Specialist