Apple Time Capsule Custom Firmware Free

Unpatched Security Holes: The KRACK attack (WPA2 vulnerability) was never fully patched on older AirPort models.
No Modern VPN Support: You cannot run WireGuard, OpenVPN, or ZeroTier natively.
Static SMB Protocol: The built-in file sharing uses an ancient version of SMB, leading to slow transfer speeds (often capped at 20-30 MB/s).
Poor SSD Optimization: If you upgrade the internal HDD to an SSD, the stock firmware doesn’t support TRIM commands, leading to rapid SSD degradation.
No QoS or Traffic Shaping: Forget about modern gaming or streaming prioritization.

The biggest hurdle to true custom firmware (like OpenWrt or DD-WRT) is that Apple's firmware images are digitally signed and encrypted