I check schematics , the input circuit is designed for > 700MHz only , so If you need low frequency you must modify input circuit. The spec. of LM70002M is 100KHz-3.8GHz but I don’t know why Lime design team designed input circuit very bad, there is no input filter as RTLSDR or SDRPLAY. There is no way to improve HF by software , you need to mod input circuit for using with HF.
