https://devzone.nordicsemi.com/f/nordic-q-a/125650/nrf5340-uart-rx-missing-bytesHello, I&#39;ve seen some posts mentioning a problem with the UART missing bytes on the RX, potentially at higher baudrates. I&#39;m communicating with a module that uses a 921600 baudrate, and using SDK 3.1.0 . I was using the nRF52840, which had the sameen-USTelligent Community 13Thu, 20 Nov 2025 11:49:55 GMThttps://devzone.nordicsemi.com/thread/554887?ContentTypeID=1Thu, 20 Nov 2025 11:49:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0a1c22e3-7656-45dc-869b-f37166a52255Kazi Afroza Sultana<p>Hello,</p> <p>Your configuration and overlay look good. Can you check that timer you have used (CONFIG_UART_1_NRF_HW_ASYNC_TIMER=3 and CONFIG_NRFX_TIMER3=y) is not used for any other peripheral or for any other library?&nbsp;&nbsp;<span></span></p> <p>Also do you have&nbsp;<code dir="ltr">UART_RX_BUF_REQUEST&nbsp;</code><span>in the UART async callback function in your application code?</span></p><div style="clear:both;"></div>