Models running firmware 4.0 and beyond use EEPROM instead of ROM and thus are upgradeable. Earlier dual core DDR2 based platforms were upgradeable to quad core chips. The game features a total of four unique, playable and upgradeable gunships. Similarly to the Nintendo DSi, the menu has upgradeable firmware. The HDD and RAM can be upgradeable. This phone comes with Android 6.0.1, upgradeable to Android 7.1.1. All models come with 4GB of system memory that is upgradeable to 8GB. This is socketed, and thus upgradeable with an NEC V30. Windows Phone 8 devices will be upgradeable to the next edition of Windows Phone 8.1. "Monster Hunter 2" has an improved weapon tree and upgradeable armors. It was released with Android 2.3 and is upgradeable to Android 4.1. Each titan possesses unique, upgradeable abilities that can reinforce friendly fleets or weaken enemies. This product also supports upgradeable ROM code. The hx2000 series and some later models are upgradeable to newer versions of Windows Mobile. The helmet system will be designed to be easily upgradeable.