如果升级到最新工具包，可能导致curiosity NANO开发板无法烧录程序。这个时候可以通过简单的退回老版本工具包固件恢复开发板功能
方式，在工程单击右键，找到最后一项工程属性，点进去，按下面的顺序找到工具包版本选择，只要不选下图中最新的即可，确定保存
重新编译烧录
会检测编程器固件版本，并恢复丢失的BOOT
然后进入烧录程序，完成应用程序固件烧录
- *****************************************************
-
- Currently loaded versions:
- Application version...........1.27.129 (0x01.0x1b.0x81)
- Tool pack version .............1.12.711
- Entering firmware upgrade mode
- Currently loaded versions:
- Boot version..................0.0.0 (0x00.0x00.0x00)
-
- *****************************************************
-
- Currently loaded versions:
- Application version...........1.27.129 (0x01.0x1b.0x81)
- Tool pack version .............1.10.488
- Entering firmware upgrade mode
- Currently loaded versions:
- Boot version..................0.0.0 (0x00.0x00.0x00)
- Updating firmware application...
- Currently loaded versions:
- Application version...........1.25.116 (0x01.0x19.0x74)
- Tool pack version .............1.10.488
- Target voltage detected
- Target device PIC18F16Q41 found.
- Device Revision Id = 0xa0050000
- Device Id = 0x7560
- Calculating memory ranges for operation...
- Erasing...
- The following memory area(s) will be programmed:
- program memory: start address = 0x0, end address = 0xff
- program memory: start address = 0x1500, end address = 0x16ff
- program memory: start address = 0xff00, end address = 0xffff
- configuration memory
- Programming complete
| 
楼主
