Down từng manual cho từng model nha
1.5300:
http://www.odeon.cn/5300_usbflashing_usbupgrade
2.611N
http://www.odeon.cn/6110_navigator_flash_changelanguage
3.6125
http://www.odeon.cn/6125_flash_changelanguage
4.6630
http://www.odeon.cn/6630_flash_changelanguage