编译了eagle_ble_sdk/vendor/B91_ble_sample 这个demo，烧录进板子后就不能再烧录别的程序了，请问怎么解锁flash？重置芯片的方法是否为长按flash reset不松开并长按chip reset？

Copy F:\TelinkWorkSpace\eagle_ble_sdk\B91_ble_sample\output\B91_ble_sample.bin to: C:\Users\qiusitao\.burning [OK] Command: [D:\Telink\telink_v323_rds_official_windows\Windows\Disk1\Redist\FlashBurner\SPI_burn.exe, --image, C:\Users\qiusitao\.burning, --addr, 0x0, --verify, --unlock, --erase-all, --port, 9900] image_filename: C:\Users\qiusitao\.burning NDS32 Burner BUILD_ID: 2020102816 Attempting to connect to 127.0.0.1, port 9900 image size: 50612 bytes unlocking erase from address = 0x0 mxic_erase: Flash block locked. Delete the image copy C:\Users\qiusitao\.burning exitValue: 0 Spend time: 1s