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When the firmware update process Xiaomi Redmi 3S to be completed, the error message dummy bin not found appears in XiaoMi Flash Tool. Based on experience, the issue occurs if you use Fasboot ROM MIUI 8 Global Stable v126.96.36.199. Follow the step by step below to fix the dummy.bin not found problem.
An unlocked phone means a device that is not associated with any carrier, plan and support global frequency bands so it can be used in other countries. When choosing a plan, insert the carrier SIM card into the phone, and you are ready to go. If you decide you want to change your carrier later or want to travel abroad, it's as simple as replacing your existing SIM card with your new SIM and activating your new plan.