How to manually install CUDA on Jetson nano?

I have a Jetson Nano product of Advantech (built-in 1TB HDD). But unlike other Nano, this product does not use SD card to burn the system, or this model of Nano system card is on-board. I want to install CUDA. But I couldn’t find any recover or reset keys on the board.
How to manually install CUDA on nano using the installation package.
Jetpack version should be 4.3.

I look forward to your reply.

Hi Lee777,

Please download SDK Manager and follow these instructions to install CUDA via JetPack.