Fortunately, the open-source community has stepped in. By flashing custom firmware onto your Apple Time Capsule, you can transform an obsolete backup box into a powerful, secure, modern router and NAS.
Reinstall the drive into the Time Capsule. Upon boot, the onboard bootloader points to the modified partitions on the hard drive. Alternatives to Custom Firmware apple time capsule custom firmware
Carefully peel back the rubber base (on flat models) or pry open the plastic bottom clips (on tower models). Remove the internal fan and blast out the accumulated dust. Fortunately, the open-source community has stepped in
Apple Time Capsule Custom Firmware: Giving New Life to Vintage Hardware apple time capsule custom firmware