1º Probar con frida

frida --codeshare licitrasimone/flutter-ssl-pinning-bypass -f YOUR_BINARY

frida --codeshare ssecurityy/universal-robust-advanced-root--ssl-pinning-bypass -f YOUR_BINARY

2º Probar a parchear el APK

1. Reflutter

git clone https://github.com/Impact-I/reFlutter.git

reflutter .apk

2. Firmar

wget https://github.com/patrickfav/uber-apk-signer/releases/download/v1.2.1/uber-apk-signer-1.2.1.jar

java -jar uber-apk-signer.jar --allowResign -a release.RE.apk

3. Instalar

adb install release.RE.apk