Oppo is back again with a new smartphone series which is the rumoured Oppo Reno 5 series. The rumours have it that the new series will contain three smartphones- Oppo Reno 5, Oppo Reno 5 Pro, and Oppo Reno 5 Pro Plus (the names are not yet officially confirmed by Oppo). The new series is rumoured to launch on December 10. As per a post on micro-blogging site Weibo, the company claims that there will…