The OnePlus Nord 2 5G is a mid-range smartphone and was released in July, 2021. It's the successor of the OnePlus Nord and features a 6.43" 90 Hz Fluid AMOLED and runs on a MediaTek MT6893 chipset.
First, heat up the back panel with a hairdryer or similar tool. Then, pry up the back panel, but make sure to use plastic prytools instead of metal ones. Then the back will come off.