Because the AirPort firmware was based on a heavily modified NetBSD derivative, some purists have cross-compiled FreeBSD for the Time Capsule. This is for anyone except kernel developers. You will lose Time Machine support entirely.
Yes, you read that correctly. An exploit in AirPort Utility 5.6 allows you to drop a custom config file that enables root SSH on the stock OS. apple time capsule custom firmware
– Limited support
(The IP addresses will vary. This is the most dangerous step. If the flash fails, your NAND is bricked.) Because the AirPort firmware was based on a