Any other requirement for HEX on DFU in Android OS?

[jimlin]

Hi guys, I install V1.6 nRF ToolBox apk in my Android phone, and want to do the DFU operation. When the device in DFU status, I select the target HEX file but it shows me INVALID file so that the Android phone could not connect to the device. I found the 'ble_app_hrs.v7_1_0.hex' in the SDK folder should be OK with 'Init file selected' displayed. So, is there any other file needed exclude app hex? Or other setting ? The SD version is 7.0 and SDK is 6.0.

Thanks a lot.

[Hung Bui]

Can you access Github ? https://github.com/NordicSemiconductor/Android-nRF-Toolbox