How to decrypt ZTE F6600P router's encrypted “config.bin” file?

I have a ZTE F6600P (Software Version V9.0.10) router provided by my ISP, and I'm trying to retrieve certain credentials stored in the configuration. Previously, with a different router, I could download the config.xml file directly from the web interface and extract the needed information. However, with this new router, the backup file is in an encrypted config.bin format. So far, I've tried the following: Downloaded the config.bin file from the router's web interface. Used tools like the ZTE config utility , but the router appears to use a newer encryption algorithm (payload type 6), which i

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