Impossible to change constellation XM1110 SPI with $PMTK353

I got a problem trying to change the constellation for my XM1110 GNSS (firmware AXN_5.1.1), I have a GNSS who works perfectly I send it commands (through SPI) at startup to configure the data I want to recieve and I recieve them nicely (change data rate and message rate : commmand 314 and 220).
But when I try to change the constellation (command 353) it erases the previous commands and don’t change the constellation, it’s like a reset.
I tried to set the constellation first and then make the other configuration -> same effect.

Did I miss something? Is there a special manipulation to change constellation?
Thank you for your attention :slight_smile: