I successfully managed to upgrade my FiPy. I don't have any GPy but I have custom board with G01 ready. I am not able to try the upgrade, because there is no SD card slot on that board. About 10 days ago Daniel wrote me that they are working on scripts for upgrade through serial interface.
There was no new firmware release for about a month already. I just hope that there is not any hardware flaw in boards equipped with Sequans LTE modem.