Use any hex editor apps that are available for android and change the value of HEX Dword to any amount you want.
Gems HEX 8962BE5C Dword
Coins HEX ECEF7667 Dword
If the codes doesn't work, it is possible that your android version is not compatible with the code I provided above.
Fortunately you can do it manually! To do it manually, just use search function in your hex editor app, enter your current Gems and Coins value in Loot Raiders and search for it (choose DWORD) .
If you see a small list of results, example 10. Just edit the value of them one by one until you can find the real HEX!
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Turn off your wifi/3G/4G internet connection before you launch the Loot Raiders. In-case you already open the Loot Raiders, just force close or press your multitask button and swipe it out.