Save before 1 mission. All the parameters of the character. Play!
All the progress made, and they are:
-50 horseshoes and oysters and images;
-Rooftop Suite worth HYDRA;
-Under the bridge stands a tank;
-All weapons (except the Molotov) with endless ammunition;
-All missions on the fireman, police and a medic.
Not used any cheat code. I did!
Installation: throw the folder with the saved games-GTA San Andreas User Files (in My Documents).