https://www.bilibili.com/video/BV1Nf4y1x7iA?from=search&seid=8672218267018754065
Someone sent me this video showing the problem (FYI it's in Chinese)...
Based on what I've heard so far:
When you try to record 4k60p or 50p in crop mode the camera will freeze or showing Err 70. You won't be able...