https://forum.odroid.com/viewtopic.php?f=178&t=34063
Install Magisk Manager
Open browser and search "magisk apk"
https://magiskmanager.com/
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console:/sdcard/Download #
Dump boot.img from partition.
Use ADB command or "Terminal Emulator" app.
$ adb shell
console:/ $ su
console:/ # cd /sdcard/Download/
console:/sdcard/Download # dd if=/dev/block/boot of=./boot.img
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console:/sdcard/Download #
console:/sdcard/Download # dd if=/dev/block/boot of=./boot.img
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console:/sdcard/Download #
Select Method -> Select and Patch a File
Write patched boot.img to partiton.
console:/sdcard/Download # dd if=./magisk_patched.img of=/dev/block/boot21540+0 records in
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11028480 bytes transferred in 2.036 secs (5416738 bytes/sec)
console:/sdcard/Download #