SPI not working properly when bootloader is flashed

SPI not working properly when bootloader is flashedhttps://devzone.nordicsemi.com/f/nordic-q-a/61143/spi-not-working-properly-when-bootloader-is-flashedHello, I have the same problem as this post . The difference is my SPI is sending out junk instead of stucking. I have tried the solution in the original post but no avail (I set NRF_BL_DFU_ENTER_METHOD_BUTTON to 0 in the bootloader sdk_config.h). Doesen-USTelligent Community 13Thu, 07 May 2020 21:37:39 GMTRE: SPI not working properly when bootloader is flashedhttps://devzone.nordicsemi.com/thread/248827?ContentTypeID=1Thu, 07 May 2020 21:37:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fde9e0a9-0591-440b-b5f9-607b22e7b04aVu<p>I found the problem. Pin P0.21 is use as reset pin in the bootloader, and I need to remove the pre-defined <span>CONFIG_GPIO_AS_PINRESET from the bootloader project.</span></p><div style="clear:both;"></div>