Booting from USB and turning on

This is my first project like this and I don’t have access to a microSD card, is it possible to get an ISO using a USB with the image on it? also I don’t know how to turn it on, I have a power supply plugged in and theres a red and blue light on but I don’t know what that means.
Thanks for the help!

is it possible to get an ISO using a USB with the image on it?

Depends on the board. For AML-S905X-CC, no, you need MicroSD card or eMMC. Only AML-S805X-AC and ROC-RK3399-PC are capable of booting without MicroSD card or eMMC this at the moment.

I don’t know how to turn it on, I have a power supply plugged in and theres a red and blue light on but I don’t know what that means.

No software was flashed. Have to go to downloads, download an image, and flash a MicroSD card.

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I got a micro SD card and plugged it in, does it have to be exclusively the ISO file or can there be other content on it? also what do I do after I plug in the microSD card

You have the wipe the content of the MicroSD card. See our guide: