pinephone pro don’t boot anymore :/ (I erased bootloader by mistake)

[fxc]

It's labelled RESET on the original PinePhone (not Pro). It's RE on the Pro Explorer Edition. I don't know what the label on the Developer Edition was, but that requires shorting test points rather than pressing the button to change the boot order - hence the hardware change for the Explorer Edition.
https://wiki.pine64.org/wiki/PinePhone_Pro#Boot_order

People have sometimes confused an original PinePhone for a Pro, or aren't clear on which hardware version they have of either phone type, so when something isn't behaving as it should it's worth checking.

I bought a pinephone pro
The button is labeled "Reset".
On the box of the device, it is written: "Beta Edition".
Does that help?

Thank you...

It does indeed help, you bought a regular PinePhone and not a PinePhone Pro. The PinePhone Pro is 399 USD, please double-check the invoice and order confirmation.

So you're basically following the wrong documentation, please look at https://wiki.pine64.org/wiki/PinePhone_I...o_the_eMMC instead and use compatible images for the regular PinePhone instead of the Pro and it should work fine. Using JumpDrive you can reflash the eMMC again. Installations on microSD card will boot with a higher boot priority on the regular PinePhone just fine too.