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no consigo que funcione

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1. Lenovo ZUK Z2 Pro uses the Qualcomm MSM8996 chip inside, it's supported by Boldbeast Recorder. Just install the recorder and go, it works great.

2. You are using an unofficial ROM. If it can only record your own voice, all recorders will have the same problem for sure, you can test and confirm the fact. In this case you should root the phone, then Boldbeast Recorder can fix it perfectly. After root the phone please enable the "Call Settings - Fix Recording Issues - Change Audio Controls" option in the recorder, you'll get good recordings at once.