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nRF51 OTA DFU: cannot write to DFU control point attribute

I am trying to do over-the-air (OTA) device firmware update (DFU) on a device with bootloader same to the "dfu_dual_bank_ble_s110" example in the latest nRF51 SDK. On the other end, I am using a BLE central module. To my naive understanding (please correct me if I am wrong), the DFU process is essentially comprised of writing to DFU control point (at handle 0x0F) and DFU packet chacteristics (at handle 0x0D) in DFU service (at handle 0x0C). All I need is to write to attributes at handle 0x10 (DFU control point value) and handle 0x0E (DFU packet value).

To start the OTA DFU, I first write 0x0001 to the attribute at handle 0x11 (DFU control point CCCD) to enable CCCD notification, which is completed successfully. And then I write the DFU start opcode 0x01 to the attribute at handle 0x10 to start the DFU process. However, I get error like "write not permitted". Could anyone tell me if I miss anything?

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