question about flash the borad, which flash file?

[sIHURs]

I would like to ask a question about the file "beekeeb_piantor_rpi_pico_vial.uf2." Should this file be loaded into both the left and right microcontrollers (raspberry pi pico)? After loading, my right-hand device actually has the layout of the left hand?

[sIHURs]

and only the keyboard connected to the USB side is working properly, while the other half shows no response when plugged in.

[m33x7]

I guess, you already figure out the answer :) anyway, for newcomers:
you need to put .uf2 on 2 parts separately while they're not connected with a cable. Now you can join them together and to PC. The side connected to the PC becomes master. For bluetooth keyboards - IDK