Oppo F27 series could be launched in India later this month, according to a poster leaked by a tipster. The series is likely to comprise three handsets — the Oppo F27, Oppo F27 Pro, and Oppo F27 Pro+. The company’s upcoming Oppo F27 Pro is also said to be the first smartphone in India to debut with an IP69 rating for dust and water resistance. One of the Pro models could arrive as a rebranded version of another…