https://www.rootmeguide.com/samsung-galaxy-s20-fe-rooting-guide-magisk/
https://www.youtube.com/watch?v=0WgK4WeGG2k
https://github.com/topjohnwu/Magisk/blob/master/docs/install.md
https://samfw.com/firmware/SM-G780G
step1: unblock oem step2: unblock bootloader step3: mod AP file via Magisk step4: turn into download mode (volumne UP + Down + Power), install AP/BL... (firmware) by Odin3 (window platform) step5: restart (chosse factory) step6: install Magisk step7: install Root Check.