problema con LG G4

Podés reinstalar el firmware, usando LG FlashTool tengo entendido, aunque no soy muy diestro con celulares LG.

Hola Oscar,

Ese hermoso movil de gama alta presenta ese problema de fabrica, el fabricante dijo lo siguiente:

LG Electronics has been made aware of a booting issue with the LG G4
smartphone that has now been identified as resulting from a loose
contact between components. Customers who are experiencing booting
issues with their LG G4s should contact their local carrier from where
the G4 was purchased or a nearby LG Service Center (www.lg.com/common)
for repair under full warranty. Customers who purchased their G4
devices from non-carrier retailers should contact an LG Service Center
with the understanding that warranty conditions will differ. LG
Electronics is committed to providing the highest standards of product
quality and customer service and apologizes for the inconvenience
caused to some of our customers who initially received incorrect
diagnoses.

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Osea que ellos cubren la reparación y debes llevarlo a la empresa donde lo compraste, muchos clientes indican luego que el anuncio quedo en palabras y algunos han intentado repararlo de diferentes formas, ojo bajo tu responsabilidad.

https://www.youtube.com/watch?v=fXWSXPp_brE