Download firmware

Hello friends, I know that this request will be different, but I need the firmware for rover in version 3.3.0, I tried it for Mission planner 1.3.35 which has the option to download different versions and is no longer working, apparently it was disabled, and now I ask how do I get the firmware for this version to download. I have the parameter of an equipment working 100%, and I need to clone the same equipment, that is, have 2 equal equipment, if you can help me, I will be very grateful.

take a look at firmware.ardupilot.org if it is not there you can compile it yourself.