升级的话你直接EMUI官网下载对应版本对应型号的升级进行SD卡升级好了。至于国外漫游的话你拿着这《 GSM 900 MHz: 880–915 MHz (UL), 925–960 MHz (DL) GSM 1800 MHz: 1710–1785 MHz (UL), 1805–1880 MHz (DL) GSM 1900 MHz: 1850–1910 MHz (UL), 1930–1990 MHz (DL) TD-SCDMA B34: 2010-2025 MHz (UL) TD-SCDMA B39: 1900-1920 MHz (UL) TDD LTE B38: 2570-2620 MHz TDD LTE B39: 1880-1920 MHz TDD LTE B40: 2300-2400 MHz》去问你要用的卡的运营商好了~