Always verify the checksum (MD5/SHA1) before flashing. A mismatched checksum indicates a corrupted download.

Installing the official resets your phone's software back to factory specifications. This technical guide outlines everything you need to know about downloading, prepping, and installing the stock ROM safely. Why You Need to Flash Stock Firmware

If your M654 works but is just slow, try official updates first. Only switch to custom firmware if you need carrier unlocking or band locking.

to act as a bridge for Bluetooth and Wi-Fi IoT devices. This eliminates the need for separate third-party gateways for smart door locks or lighting : While the

Ensure your phone has at least 50% battery charge to prevent it from powering off mid-process.

Press and hold the or Volume Up key (this triggers the boot mode connection).

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UpgradeDownload_Tool.exe (RDA official), RDA USB drivers.

Send AT+CLCK="PN",0,"00000000" – This often fails because manufacturers disable it. In that case, custom firmware is the only route.

Note: This step-by-step example covers the widely applicable MediaTek (SP Flash Tool) workflow. If your specific variant uses an SPD chipset, the workflow remains identical in principle but utilizes the SPD Upgrade Tool to load a .pac file. Step 1: Extract the Files

| Feature | Official China Mobile FW | Custom / Unlocked FW | |------------------------|--------------------------|----------------------| | SIM locking | Locked to CMCC | Unlocked | | IMEI stability | Safe | Risky if bad source | | Band selection | Limited | Full LTE band control| | Wi-Fi performance | OK | Optimized (often better) | | Warranty | Valid | Voided | | Risk level | Low | Medium to High |

Regular firmware updates are essential to ensure that the device remains secure, efficient, and feature-rich. China Mobile periodically releases firmware updates for the M654 model, which can be downloaded and installed via:

Note: The first boot after flashing can take up to 5–10 minutes to complete. Troubleshooting Common Errors