This method is not correct. if you see on the upgrade 12500 coin you will open mod.Again test. if you open first time will be crash. I dont see on test 12500 coin or 250 diamond. (I added negative value 12500 coin and 250 gems.)
It is still really complicated. I tried several time on shop expansion with 250 gems. Almost every time you turn gems on firstly, it crashes. Only if i turn coin first, and then gems. But that's not all. Every time i got gems and tried to save or interact with anything in game it crashed or internet lost connection. But, i tried to turn off gems and save, it worked!