Use this diagram to begin installing the modchip into the Switch OLED.
There are three diagrams to choose from.
Watch this video to get start modding : https://youtu.be/MH6tuykZiKY
Updated guide : https://youtu.be/sSBdltReQkg
The release page contains the "official" firmware from the Chinese manufacturer, but they are now miles behind the custom firmware. So to get the best of your flashable modchip, please use the custom firmware made by https://github.com/hwfly-nx
If you want to use the chinese firmware, please go to : https://www.chipnx.com/sup/
If you need to flash / update / unbrick using a hardware programmer, please use this guide as your reference and follow this guide : https://youtu.be/RK5FQZe1MAs
If somehow you don't have / lost the USB connector to flash the chip, you can follow this diagram to make your own USB cable