NVIDIA Jetson Nano BO1 not booting up

I bought a Jetson Nano BO1 development kit and I followed the steps given in the manual to flash the SD card and when I put the SD card in, it just isn’t booting up. All I see is the NVIDIA logo screen and then nothing. Can you please help? Thank you.

please prepare x86 host ubuntu 18.04 and install sdkmanager on it. Use sdkmanager to flash your jetson. Changing sdcard won’t fix your issue.

It is still not working. Where can I find the right image. I went to NVIDIA.com/JetsonNano-Start and followed the instructions.