when i have 200k money e saw i can upgrade this module whit gold when i press on it his show me i must pay 0 gold i pras upgrade but game show me server error!
PS.sorry my english its really bad))) i hope to be helpful
I had this to, Upgrading it from Mk 1 to Mk 2 says it costs 0gs, and when you do try, it gives you “General error” It applies to T3 to T5