"Old firmware" refers to the software that runs on electronic devices, like smartphones, computers, or routers. It signifies that the firmware version is outdated or not the most recent one available. Full definition
addresses so that it works with older firmware (so we don't have to deploy both at the same time); allow cashaddr as send to address. (kryptomoney.com)
Or are you sticking to older firmware versions for potential homebrew reasons? (gamingreinvented.com)
Google reasons out that the issue involves firmware and not hardware, since the Nexus 5X and 6P runs on old firmware, one that doesn't support fingerprint gestures. (techtimes.com)