Does 11.6.0 compatible for LTM 4000S hardware

We have F5 1600 and 2000 LTM model and they are running 11.6.x version, I am talking to one of the company we are going to buy used model of LTM 4000S without support so question can i install 11.6.x on 4000S model or i have to get support to download new firmware for 4000S?