Just tried the speedset on the 377 on london commuter. Still doesnt work. They said in the latest update notes there was a fix for it, using brakes to hold speed going down hill. Doesn't make a differance for me as i still cant use it. Been that way since release. Am on Series X
It works for me. Try to activate it first and then set it to the desired speed, if you do it the other way round it seems to have a problem (opposed to how it works on the ECW 377)