Samsung 

https://www.proandroid.com/samsung-galaxy-s7-sigue-actualizando-nuevo-soporte-mejorado-samsung/amp/

My s7 is fast download as soon as it received the phone it is 70 in battery and suddenly it goes to 1 percent and it goes off and it lasts charging and when charging shows the battery as dead it costs so that it reaches 1 percent

My s7 is fast downloading as soon as it received oreo it is in 70 of battery and suddenly it goes to 1 percent and it goes off and it lasts to load

it will be oreo en costa rica