You can install this mod follow this step
Click …
Select apk from app
Step 2…
Find fs 20 and click FS 20
Step 3…
When click your fs 20 show 4 options you click first option and go to the next step
Step 4…
Click partial file ..
Step 5…
Click the file option
Step 6…
Click…
Assets
Data
Vehicle
Step 7…. 
Click the vehicle and find the zumbammer and in this folder you see a folder 18500PE YOU REPLACE THIS FOLDER FROM MY MOD AND ENJOY
👇Mod link 🖇️
