Can't boot from a microSD card
I moved your thread in the correct section, you posted to the section of the regular PinePhone before. That is also your issue with the image, you try to boot a regular PinePhone image instead of one for the Pro (different boards, different SoCs, not compatible). Pmbootstrap is mandatory, as explained on the wiki.
There are quite a few more issues from your description, for example did you write that you tried to boot with the "Volume up" button, instead of the RE button and that you "copied" the image, instead of flashing it and that you think that the microSD card is first in boot priority, which is false too, so it reads like you got completely false information from somewhere. Make sure to have a look at the wiki, it is all explained there, https://wiki.pine64.org/wiki/PinePhone_Pro
There are quite a few more issues from your description, for example did you write that you tried to boot with the "Volume up" button, instead of the RE button and that you "copied" the image, instead of flashing it and that you think that the microSD card is first in boot priority, which is false too, so it reads like you got completely false information from somewhere. Make sure to have a look at the wiki, it is all explained there, https://wiki.pine64.org/wiki/PinePhone_Pro
