Walton Primo F4 Firmware, Flash Tool, Driver & Upgrade Instruction Walton Primo F4 Firmware, Flash Tool, Driver & Upgrade Instruction 19 November Bijendra Narsinghani Share To: Primo F4 Official Driver, flash tools & firmware download Link: Download Here F4_4.2.2_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--- MT6572_Android_scatter.txt 5. Click Firmware->Upgrade and connect USB cable with mobile (mobile must be off) 6. Then start downloading..7. When it shows Firmware Upgrade , then installation is completed. After Firmware Upgrade give Reset to Factory setting to get all apps.
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