Use a router-level firewall or a separate guest Wi-Fi network to prevent the device from accessing your main network.
These devices often "lie" to benchmarking apps like AIDA64, reporting higher specs (RAM/Storage) than they actually possess. bigdroidos 201 link
BigdroidOS is a modified Android-based operating system frequently found on "off-brand" or "clone" devices, such as fake Xiaomi Mi Boxes or unbranded Amazon tablets. While it appears to be a standard Android skin, technical audits have flagged it for serious security concerns. The Security Risks of BigdroidOS 2.0.1 Use a router-level firewall or a separate guest