[OFFICIAL] Fastboot Flashing Instructions for Redmi 3s/3sPrime - Xiaomi Redmi 3s Guides, News, & Discussion

Hello Guys,
For flashing Stock ROM through fastboot, you need to follow this procedure:-
1. Unlock the bootloader of your MI device, Click Here [Official Link], to get unlocked.
2. Download MIUI V8.1.1.0 and extract on the PC, if you already have downloaded then skip downloading.
3. Download and extract the MIUI Flashing tool, then install on the PC by double click on it.
4. Then boot the MI device in Fastboot Mode, via Power off then Press and hold Volume Down + POWER keys both at once for a few seconds. Then connect it to PC.
5. Now Run MIUI flash tool by double click the MiFlash.exe file from the desktop shortcut or installed folder on C:\ drive.
6. Then copy the full path of downloaded and extracted MIUI ROM folder and paste onto the MIUI flash tool file locate bar.
7. Then click the Refresh button next to it, the MIUI Flash tool will automatically recognize your device.
8. Next, click the Flash button to start flashing.
9. Finally, the process gets completed and the process bar turns fully green.
10. Done!
See Image below:-
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OTA flashing instructions via Stock Recovery
1. Download MIUI Global Stable 8.1.1.0 OTA and then rename the ROM file to “update.zip” on the PC.
2. Now connect the MI device to PC and copy the downloaded and renamed ROM file, to root directory of device’s internal storage. [don’t place on any sub-folder]
3. Now boot your MI device in recovery mode, to do so power off the device > then press and Volume-Up + Power buttons both at once for a few seconds.
4. In recovery mode first choose language and then navigate and select “Install update.zip to System” > then select “Yes” to confirm. [Navigate with Volume up/down and select with Power key at recovery mode].
5. Finally, navigate and select the “Reboot” to reboot system normally.
6. Done!
See Image below:-

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Official OTA of Global Stable 8.1.6.0
Click here to download Global Stable V8.1.6.0 OTA. For installation use Recovery method.