Official Huawei Y3II (LUA-U03) Stock Firmware LUA-U03C642B103 – Download & Repair Guide

[Daniel]

The Huawei Y3II (model LUA-U03, also called Y3 II 3G) is an entry-level device trusted for its basic functions, but widely reported for issues like bootloop, bricking after failed updates, hang-on-logo, and IMEI/network errors. Flashing the correct stock firmware below helps recover dead or stuck devices, resolve software malfunctions, and restore full functionality. Always use firmware precise to your device and region—cross-flashing may permanently brick your phone.

Warning:

Flashing the wrong firmware on your Huawei Y3II (LUA-U03) can cause permanent damage, loss of all data, or lock your device. Back up everything, double-check your exact model, and consult the forum if in doubt.

Huawei Y3II (LUA-U03) Firmware Details

Device	Huawei Y3II (Y3 II 3G)
Model	LUA-U03
Firmware File	LUA-U03C642B103.zip
Chipset	MediaTek MT6580
Android Version	6.0 (Marshmallow)
EMUI Version	EMUI 4.0 (varies by region)
Build Version	C642B103
File Size	2.18GB
File Type	ZIP (extraction required)
Flashing Tool	SP Flash Tool (MTK), dload (SD card) method

Download Official Firmware for Huawei Y3II (LUA-U03)

Filename: LUA-U03C642B103.zip

Size: 2.18GB

Build Date: Not Public

Build Version: C642B103

Android Version: 6.0 Marshmallow

Download Link: Google Drive

Changelog: No official changelog available. Peer reports confirm this file repairs dead boot, fixes stuck upgrade/logo, and restores IMEI/network problems on Y3II (LUA-U03). Alias: Y3 II 3G.

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The Requirements

• Huawei Y3II (LUA-U03, also sold as Y3 II 3G)
• Matching region/country firmware ZIP
• SP Flash Tool (MTK) and MTK Preloader Drivers
• SD card for optional dload method
• Windows PC/laptop
• Battery at least 60%+ charged
• Full backup of all personal data

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How to Flash the Firmware

1. Extract the ZIP to your PC or SD card
2. Install USB/MTK drivers and SP Flash Tool
3. Boot phone to Download Mode (usually Power + VolUp from off)
4. Connect to PC, load scatter file in SP Flash Tool, or update.app for SD card method
5. Flash and wait for reboot when complete

See this illustrated guide for MTK/SP Flash Tool.

More Flashing Guides:

MediaTek (SP Flash Tool): Guide Link

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Disclaimer: Flash at your own risk. The publisher is not responsible for any data loss, hardware issues, or bricked devices. Comment for help if you encounter issues.