Sad note - I've also bricked my Huawei p6-u06.
I had no problem with changes from B607 (Vodafone) to B111 or B122. Unfortunately the final change was: B122 => B118CN.
Instalation was OK, reboot started, black screen, the end. No response even to vol+, vol-, pwr nor usb cable connection.
I am afraid, that Huawei service is the only solution. Or any idea? Thx.