Zen Ultrafone U5 Stock Firmware Flash File Download This Zen_Ultrafone U5 Firmware, PAC file can be used with any service tools capable of Flashing PAC file on SpreadTRUM Android Devices. Stock firmware are mostly needed to either upgrade or downgrade your Zen Ultrafone U5. It can also be needed to simply flash your Zen android device in order to correct certain software issues or malfunctions on the phone. Here on this page I have contained the download link for the complete Zen Ultrafone U5 Stock ROM, PAC file which can be used to flash factory OS back to your Zen Ultrafone U5. How to Download Latest Firmware and Flash Zen Ultrafone U5 with this PAC File 1. Download SPD Download Tool from here and install it on your PC. Also, it is a must to install SpreadTRUM Android drivers on your PC. You may Download SpreadTRUM Android Drivers here 2. Download your Zen Ultrafone U5, latest firmware pac File from here. 3. Open the SpreadTRUM Flash Tool you downloaded from the link above. It is co...