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I guess it's waiting for a button press to enter DFU mode.
Check out https://github.com/espruino/Espruino/blob/master/targets/nrf5x_dfu/main.c#L111
AkosLukacs
Hello, apologize if this is common knowledge, but I did a bit of search and not found the answer. When I use nRF52832-DK binary on MDBT42Q, the boot time is much shorter, as captured using PPK kit attached, the first block around 7mA is only under 200mS, but when I use the normal MDBT42Q binary (tested 2.01, 2.03, and 2.04), the boot time significantly extended to about 1.3 second. As I'm working on an application where limited energy available, the extra boot time is significant.
Any strapping I need to do to speed up boot time similar to nRF52832-DK binary?