i think release 2.3 might have broken compatibility with 1.4 keyboard firmware (though i’m using this custom one: Custom PicoCalc BIOS/keyboard firmware), diag_pico.uf2 bootloops with the diagnostic screen flickering on the screen for a second similarly to how the MicroPython builds have been doing
reverting to version 2.1 (both BOOTSEL and the BOOT2040.uf2 on SD) makes it work again