本楼层为4.4.4官方固件和去红字固件，请与ROM配套使用，刷4.4.4的ROM必须升级固件；
已包含欧版、港版、台版、开发者版、联通公开版、联通定制版、亚太版、T-Mobile版本 4.4.4固件，列表如下：- firmware_EU_3.28.401.6.zip
- firmware_EU_3.28.401.7.zip
- firmware_EU_3.28.401.9.zip
- firmware_EU_3.28.401.9_NoRed_for_S-OFF.zip
- firmware_HK_3.32.708.4.zip
- firmware_HK_3.32.708.4_NoRed_for_S-OFF.zip
- firmware_TW_3.28.709.5.zip
- firmware_TW_3.28.709.6.zip
- firmware_TW_3.28.709.6_NoRed_for_S-OFF.zip
- firmware_US_3.28.1540.5.zip
- firmware_US_3.28.1540.5_NoRed_for_S-OFF.zip
- firmware_CHS_3.32.1400.16.zip
- firmware_CHS_3.32.1400.16_NoRed_for_S-OFF.zip
- firmware_CHS_CU_3.32.1402.16.zip
- firmware_CHS_CU_3.32.1402.16_NoRed_for_S-OFF.zip
- firmware_Asia_WWE_3.32.707.9.zip
- firmware_Asia_WWE_3.32.707.9_NoRed_for_S-OFF.zip
- firmware_TMOUS_3.32.531.2.zip
以下为官方签名原版固件，s-on和s-off都可以刷入；
s-on请选择自己手机对应区域的固件包，重新上锁后刷入固件，然后再解锁，刷入recovery和ROM
以下为去红字固件，仅限
s-off刷入
刷入固件方法：
1.将下载的固件包firmware_xx_x.x.x.x.zip改名为firmware.zip，然后用以下命令刷入
- fastboot oem rebootRUU
- fastboot flash zip firmware.zip
- fastboot reboot-bootloader
adb工具包如下：