* Fix serial split for BFO9000
* Fix serial split for DeltaSplit75
* Fix serial split for Helix
* Fix serial split for MiniDox
* Fix serial split for Viterbi
* Revert "Fix serial split for Helix" since it's super complex
This reverts commit 72538df105ba6d5fe6915773a20c509f2a47785d.
We'll let the helix owner fix this issue, or dive into the code later