sed -e 's/WRITE_EXTERNAL_STORAGE".*>\s*<group\sgid="sdcard_r".*\s*<group\sgid="sdcard_rw".*\s*.*\s*(?=</permission>)/WRITE_EXTERNAL_STORAGE"\s>\n\t<group\sgid="sdcard_r"\s\/>\n\t<group\sgid="sdcard_rw"\s\/>\n\t<group gid="media_rw"\s\/>\n/g' -i .bak /system/etc/permissions/platform.xml