Unable to complete 'Getting Started with nRF9160 DK'

I have been going through the steps in this blog post: https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/getting-started-cellular/posts/getting-started-with-nrf9160-dk

I was able to complete everything up to Step 6 without fault, including updating the modem and flashing the hex file. After doing so, my DK, when powered on, very briefly flashes all four LEDs and then does not provide any further indications of any kind even after waiting extended periods of time. There are no errors or anything of that nature appearing in Segger emStudio. Any indications of similar experiences or potential causes would be much appreciated.