Hy all .
You need just 1 cannon to start.
Go to storage
Open fiddler
Set breakpoint
Go and click to the cannons go to ship ( sorry my enghlis is bad ) << buton
Make 30-80 replay
DONT ACTIVATE SIMULATE MODEM SPEED
Resume
If you have luck you have 2 cannons.
Also this is not a fast way , it take a few try until work but is a safe mode.
Is like the old bug but still work
Enjoy