Update to lollipop failed to install

[RealPsygnosis]

Hi all, my gf have an Huawei Ascend G7 with EMIUI 3.
The phone is branded unfortunately, and I want to install EMIUI 3.1. I've downloaded the zip from the official site, put the dload folder in sd and start updater but I the phone reboots to recovery and I have an error (simply failed to install). Have I'm doing something wrong?
Thank you in advance

 

[porodix]

Same here. I have tried this build C469B340. I've unlocked my bootloader. I'm guessing the code in custom.bin needs to be changed. Anyone knows the operator this has been released for?

 

[porodix]

Btw, this is the error message I'm getting.

oemsbl version list check error
check_write_data_to_partition, write data error
Software install failed!