Hi everyone, I bought a lenovo ideapad 3-14 salc laptop a week ago（AMD R-5-5500U，Vega 6，Phoenix bios type，1.8V 16MB 128Mbit dip-8 bios chip）. I want to use the advanced options and legacy boot support in the bios settings. It is said that this requires unlocking the bios files. I don’t know what to do, can you help me? my laptop bios file backup（used Minpro-1 programmer，all support 3.3V and 1.8V bios chip）：https://mega.nz/file/R2IFiI6K#w1rcC-_d5cyVeFEvvPHLvVCdqw2ci9SsDtMacc7q6Bg my laptop bios file （Lenovo official）：https://mega.nz/file/pvgTTKTC#IL6vJNVJknLhHUrQd-UjYlEI9gEjn5Jq9wC2KY60gYs —————————————————————————————————————————————————————————— In addition, I also thought of some methods myself, such as using the tools in the link below: GitHub - datasone/grub-mod-setup_var: A modified grub allowing tweaking hidden BIOS settings. I tried to use this tool to modify the bios hidden settings,It seems to be able to open the “csm support” option.In the end, I still failed, There is no legacy boot item in the bootmenu (press F12 when starting), and I can’t start from uefi mode after the modification, I can only use the Minpro-1 programmer flashing back to the backup bios file，The computer was saved. Finally, I also found a tool: https://mega.nz/file/F64jlKrI#DnSi7uI3x0wAzUvsCbXhV9JpWEGpAqL8z0AttMj1QBw（chaboot Ver216，Lenovo official）： When I used this tool, the options of uefi and legacy options appeard in bios，But it didn’t seem to have any practical effect.