Hello,
I am interested in possibly upgrading from Lexus Safety System + to Lexus Safety System + 2.0 mainly for the road sign assist.

Does anyone have recommendations on how I would go about doing this?

I have a 2018 RX

 

I don't think you can, unless the dealer can do it with the proper techno-tools

 

Hi Lorn - alas, I don't think that this is doable. The only practical answer is to try to by a leftover 2020 RX like I did, or bite the bullet new get a new 2021 one.

 

Others have told you it's impossible! Buy a new one!

 

Thought that was an optional feature not an upgrade for your year.