how to extract boot.img & recovery.img

출처 : https://unix.stackexchange.com/questions/64628/how-to-extract-boot-img

/*
  download tools
 */
$ wget https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/android-serialport-api/android_bootimg_tools.tar.gz

/*
  unpack recovery.img
 */
$ mkdir recovery
$ ./unpackbootimg -i recovery.img -o recovery
$ cd recovery
$ mkdir ramdisk
$ cd ramdisk
$ gunzip -c ../recovery.img-ramdisk.gz | cpio -i