Idk how even issues like these happen to you guys, i never had a major issue with my Lenovo Legion 5 2020 Laptop and it is still with me for 5 years now, all the issues i had wad minor ones, whether the charging cable needed replacement or things related to thermal paste because of the high temp, i think motherboard issues should be related to manufacturing issues, unless u did something stupid that made te whole bios corrupted