postflight unable to modify file

[88gb525dxQK4gt6u]

I am installing the Type to Learn 4 application onto the image using instaDMG. It installs correctly in /Applications/Sunburst/Type To Learn 4/

This part of the postflight script I got it to work fine
#!/bin/bash
mkdir -p "$3/Library/Application Support/Sunburst/Type to Learn 4"
mv "$2/development.sqlite3" "$3/Library/Application Support/Sunburst/Type to Learn 4/"
#open "$2"


The problem comes because I need to modify the ‘/Applications/Sunburst/Type To Learn 4/Settings.ini’ to point to our server.

Here is what I tried so far in the postflight script
#Overwriting file line by line
echo "database=webservice" > '$3/Applications/Sunburst/Type to Learn 4/Settings.ini'
echo "serverUrl=http://myserver:myport" >> '$3/Applications/Sunburst/Type to Learn 4/Settings.ini'
echo "version_major=1" >> '$3/Applications/Sunburst/Type to Learn 4/Settings.ini'
echo "version_minor=1" >> '$3/Applications/Sunburst/Type to Learn 4/Settings.ini'

#overwriting the whole file
cp "$0/Settings.to.copy.ini" '$3/Applications/Sunburst/Type to Learn 4/Settings.ini'

Even this delete does not work!
#deleting the file?
rm '$3/Applications/Sunburst/Type to Learn 4/Settings.ini'

What seems strange to me is that even running this on the terminal does not work either
$ sudo echo "database=webservice" > /Applications/Sunburst/Settings.ini
-bash: /Applications/Sunburst/Settings.ini: Permission denied

PS: tried with chown to root:admin and chmod 755

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