clagoeiro Always inspect a pre assembled quad before pluging it into a battery. Use a multimeter and check for continuity between and - in the battery connector, if it is shorted than something is wrong and it will definitely smoke if you plug a battery. It is also advisable to use a lower power source, not a lipo 35c ~ 100c, it will provide you more time to detect and plug it out before it smokes. When something is shorted out, a 70C capable battery might deliver all 70Cs into the short.

clagoeiro You should try to understand and solve your problem. There must be something wrong. I've did the update to betaflight 3.5 and used the config suggested by EMAX. It flies better than anything I have previously flown.