HW: Incorrect silkscreen label on PCB version resistor
The designators/labels of 2 resistors in the PCB version number circuit,
are swapped on the layout (in silkscreen).
The layout itself is correct. However, as only one of the two resistors is meant be mounted, the prototypes manufacturer has soldered in the wrong one, based on the label shown on the PCB.
Normally the pick-and-place machine should have done this and this error should not have occured (and ironically the bug would not have been discovered).
As a result the prototypes received did not have the right resistor layout and were internall identified as earlier than v4 boards, and the fast burst functionality was disabled.