If you are looking for actual documented research papers or write-ups regarding how these hardware bypasses operate, you should look for the following landmark publications:
: This is the most famous foundational research. Independent security researchers published complete breakdowns of how to bypass MediaTek's SP Flash Tool authorization using python scripts. This research paved the way for modern free GUI bypass tools. mtk-meta-utility-v50-mtk-auth-bypass-tool-free
While the developer of "MTK META Utility" did not publish an academic white paper for their specific user interface, the tool is heavily built upon open-source research and security papers regarding . If you are looking for actual documented research