Hi

I just got told by my LBS that you cannot go from 1.0 to 2.0 as Specialized have not tested the fork to be able to handle the extra stress from the locked out position. This actually makes sense. Specialized say that the 2.0 costs £800!!!! This is to stop you buying it but they also request your frame number when ordering one, so you probably could not get one even if you wanted to take the risk

I have a 2017 model Roubaix Expert with 1.0 and I just ordered a replacement and am getting a 1.5 as 1.0 are no longer available, so all 1.0 people should now get a 1.5, which is the new version but without the lockout & the hydraulic damper. However Roadbikereview says "the new Future Shock 1.5 ....h improves upon the original Future Shock". The replacement cartridge which does not include the top springs (you got 3 when you bought the bike) costs £85 from my LBS

If you have a 1.5 from new you may be able to get a 2.0 but I cannot confirm that