提取Redmi K30 Pro官方boot.img，适用于TWRP下无ROM包提取。（貌似MIUI13 ROM压缩包加密了，无法解压缩提取）
TWRP 终端自带 root 权限，故省略提权 su 命令。
首先要查找内核分区所在位置，进入 /dev/block 目录下 by-name 文件夹。输入命令：
cd /dev/block/by-name
注意
查找 boot 真实地址，输入命令：
ls -l boot
找到当前手机的 boot 地址，例如：/dev/block/sda11
boot 地址为 /dev/block/sda11 ，使用 dd 命令提取保存：
dd if=/dev/block/sda11 of=/sdcard/boot.img
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