Walton Primo E4 Firmware, Flash Tool, Driver & Upgrade Instruction Walton Primo E4 Firmware, Flash Tool, Driver & Upgrade Instruction 18 November Bijendra Narsinghani Share To: Primo E4 Driver, Flashtool & Firmware Download Link: E4_4.4.2_1 1. Install driver.2. Open Flash Tool 3. Open Download Agent and select MTK_AllinOne_DA 4. Open scatter_loading and select scatter fileSW---> Primo_E4_V1.0.0_S - CopyÃ MT6582_Android_scatter 5. Click Firmware->Upgrade andconnect USB cable with mobile (mobile must be off) 6. Then start downloading.. 7. When it shows Firmware Upgrade , then installation is completed.