Command to boot to SD Card

Hello Guys,
I have a Tanix TX9S Box S912.
Everything is working from Internal.
I just wanted to Boot from my SD Card , try a different DTB, but unfortinatly it only Boots from internal.
I use the pinhole Method.
Maybe there is a console command so i can boot from SD Card?

And pls don’t tell me , there is no support for installto internal, i just want to know if there is a similar command to boot from Sd Card like there is one to boot from Internal.

Thanks for you response.
It wasn’t quite that, what i was searching for.
I fixed my issue with writen zeros to my sd card and then writing the image back to it with rufus.

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