[Hit]

Found the string of code that unveils the Hidden Partition

void UsbPowonInit(void)
{
MY_FILE *usbTagFile;

//071213,HUANGSL,CHECK OPEN C:,BEFORE UsbBlkInitialize
usbTagFile = FSFileOpen(gpSysConfig->UsbTageFileName , "rb");
if (usbTagFile != NULL)
{
gpSysConfig->UsbDiskMask |= (0x0001 << 1);
FSFileClose(usbTagFile);
}

UsbConnected = 0;
Intr_RegISR(INTC_UDC, UDC_ISR);
UsbBlkInitialize();

USB_PHY_RST();
SOFT_CONNECT();
//UsbVbusIsr();

}

"gpSysConfig->UsbTageFileName"
Referrers to

"D:\\Rkusb.Tag", //3UsbTageFileName

Apparently "D:\\Rkusb.Tag" is changed in my player, therefor I can't unlock hidden partition
Was hoping to find an alternative method of unveiling it but it seems there isn't
And I suppose there isn't a way to change the UsbTageFileName either

Btw what it does it it changed the USBDiskMask setting in the config from 0x0007 to 0x0017 making the hidden partition mounted except of normal partition when connecting usb
Doing this with this piece of code

if (gpSysConfig->UsbDiskMask & (0x0001 << 2))
{
gUsbMscDevice[ii].IoCtrl = FlashUserIoCtrl;
gUsbMscDevice[ii].ReadData = FlashUserReadSector;
gUsbMscDevice[ii].WriteData = FlashUserWriteSector;
ii++;
}