Wio Terminal WiFi errors

Products & Technology Wio Terminal
14

I made eRPC FW upgrade and trying to run this simple test:
#include “rpcWiFi.h”

void setup()
{
Serial.begin(115200);
while (!Serial); // Wait to open Serial Monitor

Serial.println(“Starting…”);
Serial.printf(“RTL8720 Firmware Version: %s”, rpc_system_version());
Serial.println(“End…”);
}

void loop()
{
}

But all I got is: Starting… and nothing more.
Definitelly Wio hangs on communication with RTL8720.