If you also want to know some easy ways to reboot and select the proper boot device error then join the below-mentioned forum links to get detailed information.

https://disastersites.com/forums/topic/9869/does-run-automatic-repair-fix-reboot-and-select-proper-boot-devi/view/post_id/43432

https://www.altusx.com/forum/welcome-to-the-forum/are-there-any-tools-or-utilities-within-windows-that-can-diagnose-boot-issues-before-taking-further-steps

https://www.atipabangkok.com/forum/topic/156742/can-a-corrupted-boot-configuration-be-the-reason-for-this-error,-and-how-do-i-use-bootrec-commands-to-fix-it?

https://www.broadwaychurchkc.org/forum/general-discussion/how-can-you-check-if-the-hard-drive-or-ssd-is-properly-connected-to-your-computer-s-motherboard

https://www.educaccess.org/forum/general-discussions/how-can-you-use-windows-startup-repair-to-fix-boot-related-issues-in-windows-10-or-11

https://litesn.com/forums/topic/20485/repair-boot-files-to-fix-reboot-and-select-proper-device-error/view/post_id/147984

https://soporte.itse.com.co/es-ES/forums/general-discussion/f742a7ad-e895-ef11-95f6-7c1e522c2d17

https://universeornothing.com/forums/index.php?topic=606.0

https://www.tsxvresearch.com/forum/viewtopic.php?f=2&t=204335

https://feedback.rmscloud.com/forums/275090-rms-user-suggestions/suggestions/49001444-what-is-a-boot-device-in-windows-and-what-are-the

https://australianweddingforum.com/weddings/showthread.php?tid=143565

https://ifutures.pl/post287080.html?sid=00c7d0aae49a742404a14772af78720e#p287080

https://basicinfohub.com/ways-to-troubleshoot-boot-reboot-and-select-proper-boot-device/