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参考https://github.com/Zayrick/GL-iNet-GeoChanger中命令，试图修改MT3000的区域。

如果是OpenWrt 21，直接参照执行即可，如果是OpenWrt 24，dd if=/dev/mtdblock3 bs=1 count=2 skip=136 2>/dev/null | hexdump -C 不会返回地区代码，因为24和21的分区不同。

root@GL-MT3000:~# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00100000 00020000 "BL2"
mtd1: 00080000 00020000 "u-boot-env"
mtd2: 00200000 00020000 "Factory"
mtd3: 00200000 00020000 "FIP"
mtd4: 00040000 00020000 "log"
mtd5: 0f640000 00020000 "ubi"

OpenWrt 24的Factory分区是mtd2，需要执行dd if=/dev/mtdblock2 bs=1 count=2 skip=136 2>/dev/null | hexdump -C 查看地区代码。

root@GL-MT3000:~# echo -n "US" | dd of=/dev/mtdblock2 bs=1 seek=136 conv=notrunc
dd: error writing '/dev/mtdblock2': Operation not permitted
1+0 records in
0+0 records out

在OpenWrt 24写mtdblock2会报错，需要刷机回退OpenWrt 21修改地区，修改后再升级到OpenWrt 24。