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ysc3839 官方固件解包来的，magisk 这个教程就是免 recovery 刷入 patched boot 啊
In order to use this method, you are required to obtain a copy of the stock boot image, which can be found by extracting OEM provided factory images or extracting from OTA update zips. If you are unable to obtain one yourself, someone on the Internet might share it somewhere. The following instructions will guide you through the process after you have the copy of boot image.
Copy the boot image to your device
Download and install the latest Magisk Manager
Press Install → Install → Select and Patch a File, and select your stock boot image file
Magisk Manager will install Magisk to your boot image, and store it in [Internal Storage]/Download/magisk_patched.img
Copy the patched boot image from your device to your PC. If you can’t find it via MTP, you can pull the file with ADB:
adb pull /sdcard/Download/magisk_patched.img
Flash the patched boot image to your device and reboot. Here is the command if using fastboot on most devices:
fastboot flash boot /path/to/magisk_patched.img