Programming: Unable to flash chip after flashing a bad hex about nrf52840-m2-devkit

[caizelin]

@meehien Does this bad hex set P0.17 low when it boots?
According to the nRF52840 M.2 Module Schematic, the P0.17 is connected to the RESET pin for self-reset functionality. This pin can not be set to LOW without any additional action, or the device will run into a self-reset loop.

[meehien]

I had a quick look at the schematic you provided and that of the nRF52840 M.2 Developer Kit. Is it P0.17 you are refering to or P0.18? In your link, I belive P0.18 is the reset. I was not able to find where P0.17 is on the DevKi8t board, but I can confirm that the P0.18 Reset is pulled LOW on boot. Any suggestions on how to approach this?

EDIT: I was able to manually pull the P0.18 pin HIGH and erase the device. Now it seems to be working. Thanks for pointing me in the right direction.