Here a valid explanation:
Qgnss 2.2 latest link on mega because en_official do not work but cn_ https://www.quectel.com.cn/wp-content/uploads/2025/02/QGNSS-V2.2_CN.zip do if registered.
so for 57600 baud …
stop gnss engine for see only commands_debug
$PQTMGNSSSTOP*09
resp. $PQTMGNSSSTOP,OK*21
$PQTMCFGUART,W,3,57600*34 set uart3
resp. $PQTMCFGUART,OK*60
$PQTMCFGUART,R,3*29 ask&get
response $PQTMCFGUART,OK,3,57600,8,0,1,0*6E
save $PQTMSAVEPAR*5A
reboot $PQTMSRR*4B
for default all three uarts accept rtcm in & out + nmea
see $PQTMCFGPROT at 2.3.12
and for baud_setting in official doc!?:
