The guide to install FM patch,


Enter Pi-Star ssh mode
http://pi-star:2222/
User: pi-star 
Pass: raspberry

1,
Flash FM firmware, Copy the follow commands to ssh dialog: 
rpi-rw;  
curl -OL https://www.bi7jta.org/files/fm-patch/firmware/upgrade_repeater_FW_V3F4_12MHz.sh;     
chmod +x upgrade_repeater_FW_V3F4_12MHz.sh;     
./upgrade_repeater_FW_V3F4_12MHz.sh;

2, 
Update Pi-Star to the new version, ensure you have flash 4.1.0 , recommend 4.1.2 +
http://pi-star/admin/update.php

or

run the update command in ssh mode 
sudo pistar-update && sudo pistar-upgrade

3,
Restore Configuration with FM config, first download to your computer,
https://www.bi7jta.org/files/fm-patch/Pi-Star_Config_4.1.2_FM.zip
Restore:
http://pi-star/admin/config_backup.php 

4,
Manage expert mode, after you add the [FM] configuartion
http://pi-star/admin/expert/edit_mmdvmhost.php

5, 
Programming your FM radio channel ,
T CTCSSFrequency=88.5
R CTCSSFrequency=88.5


Completed!



You can also add FM config to your pi-star file /etc/mmdvmhost , then jump to Setp 4th
[FM]
Enable=1
Callsign=BI7JTA
CallsignSpeed=20
CallsignFrequency=1000
CallsignTime=10
CallsignHoldoff=0
CallsignHighLevel=50
CallsignLowLevel=20
CallsignAtStart=1
CallsignAtEnd=1
CallsignAtLatch=0
RFAck=K
ExtAck=N
AckSpeed=20
AckFrequency=1750
AckMinTime=4
AckDelay=1000
AckLevel=50
TimeoutLevel=80
CTCSSFrequency=88.5
CTCSSThreshold=30
CTCSSLevel=20
KerchunkTime=0
HangTime=7
UseCOS=1
COSInvert=0
RFAudioBoost=1
MaxDevLevel=90
ExtAudioBoost=1

[Transparent Data]
Enable=0
RemoteAddress=127.0.0.1
RemotePort=40094
LocalPort=40095