I'm also using .314 (german) + the cubeundcube root method and every is fine (using Vivo 4g at Sao Paulo)..
German firmwares always work like a charm because they have the same 4g bands as we do.
Actually German carriers also use bands 3 and 20, while the 4 Brazilian big carriers use only band 7 (also used in Germany). The big thing to keep in mind here is that all firmwares for the D6503 have the same basebands, regardless of the location. We can use any country's firmware if we want to. I just use the German one because it is usually one of the first to receive updates as they come, but on my ZL (ZQ here in Brazil) I used Russian, Nordic and even the "Commercial and Journalists" (internal Sony) firmwares without any issues at all.
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