Source: https://blog.ropnop.com/configuring-burp-suite-with-android-nougat/
openssl x509 -inform DER -in cacert.der -out cacert.pem
openssl x509 -inform PEM -subject_hash_old -in cacert.pem | head -1
mv cacert.pem <hash>.0
adb push <hash>.0 /sdcard/Download/
adb shell
su
mount -o rw,remount /system
mv /sdcard/Download/<cert>.0 /system/etc/security/cacerts/
chmod 644 /system/etc/security/cacerts/<cert>.0
reboot