A “flash file” for the MT6731 typically refers to the firmware/ROM package (often in scatter.txt format) used with SP Flash Tool to reflash a device powered by the MediaTek MT6731 SoC. Below is a concise, technically solid reference text on the topic.
MT6731 Flash File: Technical Overview 1. Platform Basics
SoC: MediaTek MT6731 (entry-level 4G chipset) CPU: Quad-core ARM Cortex-A53 @ up to 1.5 GHz Process: 28nm Common in: Low-end smartphones, feature phones, rugged terminals (e.g., Blackview, Ulefone, Doogee models)
2. Flash File Components (Typical SP Flash Tool Package) A valid MT6731 flash file package must contain: | Partition | Image File | Description | |-----------|------------|-------------| | Preloader | preloader_mt6731.bin | BootROM stage 1 – critical, device-specific | | LK (Little Kernel) | lk.bin | Secondary bootloader (fastboot) | | Boot | boot.img | Kernel + ramdisk | | Recovery | recovery.img | Recovery environment | | System | system.img | Android OS (usually AOSP/Go edition) | | Vendor | vendor.img | Vendor customizations (if A/B or dynamic) | | Data | userdata.img | Factory data partition | | Cache | cache.img | Temporary cache (often omitted) | | NVRAM | nvram.bin | IMEI, Wi-Fi/BT MAC, calibration data | | Tee | tee.img | Trusted Execution Environment | | Logo | logo.bin | Boot logo splash | | Secro | secro.img | Secure data (network locks, etc.) | | Metadata | – | Dynamic partition metadata (Android 9+) | | Super | super.img | Logical system/vendor/product (Android 10+) | mt6731 flash file
Critical: NVRAM and secro are device-unique. Flashing generic versions may cause IMEI loss or network issues.
3. Flash Tool Requirements
Tool: SP Flash Tool v5.19xx or newer (MT6731 requires DA file support) Driver: MediaTek USB VCOM driver (preloader mode) Mode: Download only / Firmware Upgrade / Format all + download (use caution) Auth File: Some MT6731 devices need auth_sv5.auth (secure boot) – obtain from OEM A “flash file” for the MT6731 typically refers
4. Common Issues & Solutions | Problem | Likely Cause | Fix | |---------|--------------|-----| | S_BROM_CMD_STARTCMD_FAIL (0xC0060005) | Wrong preloader | Use correct flash file | | S_DL_GET_DRAM_SETTING_FAIL (0xC0070004) | Incompatible DA or preloader | Flash original firmware first | | NVRAM checksum error | Wrong NVRAM partition | Restore backup or recalibrate | | Boot loop after flash | Missing vbmeta or verified boot | Disable AVB: fastboot --disable-verity | | IMEI = null | NVRAM corrupted | Write back IMEI via SN Writer Tool | 5. Flash File Acquisition
Official sources: OEM support portals, authorized service centers Unverified sources: Needrom, 4pda, XDA-Developers (verify MD5/hashes) Backup before flashing: Use MTK Client or WWR MTK to dump partitions from a working device
6. Security Notes
Preloader locking: Never flash an MT6731 preloader from a different device variant (even same SoC) – it can cause a hard brick requiring EMMC pin shorting. Secure boot: Many MT6731 devices have RSA-signed preloader. Flashing an unsigned one will trigger boot ROM rejection. Anti-rollback: Check if ro.boot.anti_rollback is set – downgrading may lock the device.
7. Example Flash Command (SP Flash Tool CLI) flash_tool.exe -s COM10 -b MT6731 -d -i scatter.txt -c download
