How to hack dr. driving coins and upgrades?(Only Rooted Phones}

Step 1:- Open dr. driving and click on the car icon to go to the car shop

Step 2:- Open game killer and search the amount of coins you have

Step 3:- After that, decrease your coins in the game

Step 4:- Then, open game killer and again, search the current amount of coins you have

Step 5:- Wait for the result and then search for the 'dw' or 'dwb' extension in the result

Step 6:- Click on that file and click on the view memory list 

Step 7:- Now change the value of last numbers of the second row to "59"

Step 8:- Also, change the entire value of fourth row to "09 09 09 09 09"

Step 9:- Now get back to the game and upgrade your engine and tires and everything until you max out

(Note:- The upgrade hack will not work after you close the game but the effects will be everlasting)