HOW do I erase SDK5.2 version of flash and read not, in SDK4.2 can.

HOW do I erase SDK5.2 version of flash and read not, in SDK4.2 can.https://devzone.nordicsemi.com/f/nordic-q-a/2103/how-do-i-erase-sdk5-2-version-of-flash-and-read-not-in-sdk4-2-canHello: Why do I erase SDK5.2 version of flash and read not, in SDK4.2 can. I tested nrf51_sdk_v5_2_0_39364\nrf51822\Board\nrf6310\flashwrite_example is a good example.However, I use the store will not work inside BLE，This is a screenshot of my DEBUGen-USTelligent Community 13Tue, 14 Nov 2017 10:43:53 GMT