Me autorespondo y recomiendo no actualizar hasta que los usuarios que lo hemos realizado vayamos viendo como va el tema
No se puede hacer un downgrade4
Unfortunately in case of EMUI 3.0 is not true anymore!
I yesterday downloaded the new, EMUI 3.0 ROM (B604) for my P7-L00 and installed without problem. The new UI is promising and interesting, but it is the first developer version and still has some bugs. So, I decided to put back the old, but well-functioning ROM (B125SP03).
But I cannot do it! Nor the so-called three-button method, neither using the upgrade app works. The process starts but some seconds later the Recovery (which also has new look) says that the flashing process failed. Without further explanation, error code or something.
So, now I don't know, how to get back my previous firmware... Any idea?