Create the file /data/data/com.instagram.android/shared_prefs/devprefs.xml and add the following content. (You will need root access to modify it)
<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<map>
<string name="debug_allow_user_certs_ttl">1557909551442:86400000</string>
<boolean name="debug_allow_user_certs" value="true" />
<boolean name="debug_disable_liger_fizz" value="true" />