This ROM is both a stock B550 as from Huawei and a custom ROM. So let’s just say that this could be a way to update your phone without using Huawei recovery, or install a nice and personalized ROM.
How is it possible? Let’s introduce the AROMA installer. With this little software that run over the recovery you won’t need to do a lot of passage to customize your ROM inside a chinese recovery.
We have got only 2 recoveries so far:
What I discovered is not encouraging at all… Like the boot partition that has the reserved partition as digital signature, also for the recovery we have something similar. In fact we have a 800 Bytes header that works as Huawei digital signature, just before the magic number ANDROID! (always at the very beginning of the boot.img).