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How to trigger DFU OTA ? (for custom application with dfu services enabled)

I have merged all the 4 file's together (app.hex, app_valid_settings.hex, softdevice.hex and dfu.hex). Then I uploaded the custom app with dfu services enabled using nrfgo Studio. (Custom app = UART example) The board starts advertising and works properly till here.

But I can't figure out how to initiate DFU services for next upload (i.e. Trigger DFU from android app).

So that nrf51 goes in bootloader mode, starts DFU and gets ready to take new image over the air.

How to trigger DFU for next upload ? (there is no DFU button in android app as it appears for dfu enabled heart rate example)

Do I have to keep reset button pressed or something else, so that board goes in bootloader mode ?

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