Para los que le dan problemas al flashear el archivo cust por fastboot
If you can't flash cust, you need make Read-write cust partition.
You need root.
go to adb, and type:
adb shell
su (if you sucessful "su" - you have root premission for adb = GREAT)
mount -o rw,remount -t ext4 /dev/block/platform/msm_sdcc.1/by-name/cust /cust
exit
exit
Sacado del foro de facebook Huawei G6 Development:
https://www.facebook.com/groups/328261053999820