What does "DFU REMOTE OPERATION FAILED (6)" from DFU in nRF toolbox mean?

Question

I'm testing with Soft Device 8.0.0, ble dfu operation with single bank, nRF toolbox on Android version 1.13.1 (installed on 5/11/2015). I generated a zip distribution file with nrf.exe command:
"C:\Program Files (x86)\Nordic Semiconductor\Master Control Panel\3.8.0.7
rf
rf.exe" dfu genpkg --application "$H/Preppad2_rev_K_ble_app.hex" "$H/PrepPad2_rev_k_ble_app.zip" 
 The update proceeds for a few seconds and then quits with an error flashed briefly on the screen. The error message says 
 Upload failed: REMOTE DFU OPERATION FAILED (6) 
 
 What does this error mean? 
 Where can I see a log of the dfu progress? 
 How do I fix this problem?

Anthony Ambuehl · Accepted Answer

I am using the nrf tool in master control panel 3.8.0, which btw can be inferred from the path to the tool shown in my original message. The nRF toolbox is also the latest version since as I mentioned I installed it on 5/11/2015. The SDK is 8.0.0 and various source code is pulled from the PACK files in Keil. 
 Luckily, I discovered a solution to the problem! 
 For anyone else hitting this problem...the documention for nrf.exe is very limited. I realized through debugging the dfu bootloader the init packet was not in the correct format. After experimenting with the nrf.exe I discovered it requires additional optional arguments on the command line to generate the extended format init packet. Also the soft device firmware ID code used for the 8.0.0 softdevice is 0x64. 
 The command that I used to generate a good "extended format" init packet: 
 "C:\Program Files (x86)\Nordic Semiconductor\Master Control Panel\3.8.0.7
rf
rf.exe" dfu genpkg --application "$H/ble_app.hex" --application-version 0xffffffff --dev-type 0xffff --dev-revision 0xffff --sd-req 0x64 "$H/ble_app.zip" 
 NORDIC: It would still be very helpful to have descriptive error messages from the DFU tools and a log of all the progress for debugging.

What does "DFU REMOTE OPERATION FAILED (6)" from DFU in nRF toolbox mean?

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