Hi Aburton, How did you upgraded to new bootloader? did you go to bootloader mode and replaced the UF2 file? or you have upgraded by programmer?
I guess! the updated bootloader saves and runs the program binary from internal flash of NFR52. I think this means we are losing the space from external 16Mb QSFP and it would be disabled to save the current. That is not a big deal if we can use deep-sleep mode.