FirmwareUpdater prints an error in the terminal even if the boards are programmed

[S-Dafarra]

I recently had to update the firmware on the iCub3 robot. After the update (it was not updated for a year more or less), the yarprobotinterface was complaining about a wrong firmware version. So I tried to update the robot with the latest firmware in master, but the FirmwareUpdater printed in the terminal the following errors

EthMaintainer::cmdProgram() is about to program the APP partition of 13 boards: 10.0.1.1 (candoit) 10.0.1.2 (candoit) 10.0.1.3 (candoit) 10.0.1.4 (candoit) 10.0.1.5 (candoit) 10.0.1.6 (candoit) 10.0.1.7 (candoit) 10.0.1.8 (candoit) 10.0.1.9 (candoit) 10.0.1.10 (candoit) 10.0.1.11 (candoit) 10.0.1.12 (candoit) 10.0.1.13 (candoit)
ERROR: EthMaintainer::program() could not program board none @ 0.0.0.0: 10.0.1.1: APP NOK
10.0.1.2: APP NOK
10.0.1.3: APP NOK
10.0.1.4: APP NOK
10.0.1.5: APP NOK
10.0.1.6: APP NOK
10.0.1.7: APP NOK
10.0.1.8: APP NOK
10.0.1.9: APP NOK
10.0.1.10: APP NOK
10.0.1.11: APP NOK
10.0.1.12: APP NOK
10.0.1.13: APP NOK
.

I tried multiple times and I always had the same result. @julijenv told me he noticed a similar issue also while updating iCubGenova04.

Nevertheless, I tried to relaunch the yarprobotinterface and it started correctly, so I am wondering whether those errors are false positives.

@marcoaccame