Revert "fix another typo"

This reverts commit eb1fe9cb7d2591fcd9ac2b9648f00cce85c4f5a1.
Revert "fix"

This reverts commit 30f5f02429643d51f00c31489d2bf9d54577a8f1.
Revert "Remove wifi tether&dual band, add background scan"

This reverts commit f1fc5b102a76bfb321bc0c6ef0948583c7a8fbc0.