Upgrade your V3F4 firmware

sudo killall MMDVMHost >/dev/null 2>&1 ;
sudo ~/stm32flashV5 -v -w ~/fw_F446_v3a_12.0MHz/MMDVM/bin/mmdvm_f4.hex  -R  -i 20,-21,21:-20,21 /dev/ttyAMA0;


Update your MMDVMHost
Login ssh:

1,
Backup old file
rpi-rw;
sudo mkdir mmdvmhost_old;
sudo cp /usr/local/bin/MMDVMHost ~/mmdvmhost_old/;
sudo cp /etc/mmdvmhost ~/mmdvmhost_old/;


2,
Move to execute directory
rpi-rw;
sudo cp /home/pi-star/mmdvmhost_build/MMDVMHost/MMDVMHost /usr/local/bin/MMDVMHost;
sudo chmod 755 /usr/local/bin/MMDVMHost;
sudo cp /home/pi-star/mmdvmhost_build/MMDVMHost/MMDVM.ini /etc/mmdvmhost ;


3, Restart MMDVMhost
sudo /usr/local/sbin/mmdvmhost.service restart

4, Edit expert mode
http://192.168.1.28/admin/expert/edit_mmdvmhost.php