https://devzone.nordicsemi.com/f/nordic-q-a/94517/erasing-uicr-affect-gpios-readhi Nordic i am working with nrf52832, running with zephyr and ncs1.91 i had to use nrfjprog -- eraseuicr to change serial number on 0x10001080 and after that something strange had happen an ADC read of a certain GPIO suddenly became zero any ideaen-USTelligent Community 13Sun, 04 Dec 2022 21:22:27 GMThttps://devzone.nordicsemi.com/thread/398890?ContentTypeID=1Sun, 04 Dec 2022 21:22:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c96fb372-33b2-469b-b6e3-c07b520dc1ffziv123<p>found the issue</p> <p>pin p0.09 on nrf52832 is an NFC pin and when erasing the UICR it returns to it&#39;s default which is UICR, if i want to be using it as a GPIO i need to add&nbsp;this config&nbsp;to my baord .conf file:&nbsp;&nbsp;</p> <div> <div><span>CONFIG_NFCT_PINS_AS_GPIOS</span><span>=y</span></div> <div><span></span></div> <div><span>that way even after erasing UICR i still uses the pin as a GPIO</span></div> <div><span></span></div> <div><span>best regards&nbsp;</span></div> <div><span>Ziv</span></div> <div></div> </div><div style="clear:both;"></div>