A notorious issue where the high-voltage traction battery fails to top up the small 12V starter battery, leaving the car dead. A BMS firmware update revises the "wake-up" logic to prevent this.
Despite best efforts, updates can fail. Here is the troubleshooting hierarchy for a failed MG4 firmware update.
If an OTA update is available for your vehicle:
Before searching for an update, you need to know what you are running.
Pro Tip: Join MG4 owner forums (like MGEVs.com or the MG4 subreddit). Users often share the latest version numbers for your region. Compare your numbers to theirs. If yours are more than six months older, schedule an update.
Understanding the three types of MG4 firmware update methods is critical. Not all updates can be performed at home.
If a dealer update fails, the car enters "limp mode" or "engineering mode."
Symptoms of a failed firmware flash:
What to do:
Don’t chase every rumoured update. If your car works fine, wait for your next service. But if you’re facing annoying bugs, definitely ask your dealer to check for module updates—they can transform the driving experience.
Have you had an MG4 update recently? Share your version number or experience below! 👇
Updating the MG4's firmware is a comprehensive process that typically requires a dealer visit
rather than a simple over-the-air (OTA) download. While the infotainment system (FICM) might eventually support OTA, critical safety and performance modules—like the Battery Management System (BMS) and Electronic Power Steering (EPS)—must be updated manually via a physical OBD connection 🛠️ Key Firmware Versions & Improvements
Updating from older software (like R33 or R38) to newer iterations (R42, R59, or R11 depending on the region) provides significant quality-of-life changes: Lane Keep Assist (LKA) Refinement
: The "aggressive" steering wheel tugging is reduced, and newer versions (R59) add a one-click shortcut to disable it. Climate Control Fixes mg4 firmware update
: Resolves bugs where AC settings reset randomly or the temperature requires a weird +5°C offset to feel accurate. Infotainment Stability : Faster boot times, reduced lag, and better stability for Wireless Android Auto/Apple CarPlay Adaptive Cruise Control (ACC)
: Updates improve intuition, allowing for 5 mph increments on long button presses and memory for the last distance setting. Battery Preconditioning
: Improves the stability of the battery pre-heating button, which is essential for fast charging in cold weather. 📋 Pre-Update Checklist Since updates can take anywhere from 20 minutes to several hours , preparation is key: Document Faults
: Dealers often only perform "non-mandatory" updates if you report specific issues (e.g., "LKA is too aggressive" or "Apple CarPlay disconnects"). Book a Dedicated Slot
: Don't assume a standard 1,000km or annual service includes all firmware updates; explicitly ask for a full control unit scan Backup Settings
: Major updates might reset your driver profiles, radio presets, and Bluetooth pairings. Check Battery Level : Ensure your car has at least 20-30% charge
before bringing it in, as some modules may not update if the 12V or traction battery is too low. ⚠️ Potential Issues to Watch For A notorious issue where the high-voltage traction battery
Even "stable" updates can introduce new quirks or leave old ones behind: Persistent Offset
: Some users report the temperature sensor still feels "off" even after the R33 update. Volume Bug
: A known issue where the volume might continue to drop to zero even after releasing the steering wheel joystick. Update Failure
: In rare cases, a failed install can result in a blank screen, requiring a full system reset by the dealer. How to Check Your Current Version
You can find your current infotainment version by navigating to: Software Version If your version number ends in , you are likely several generations behind the current
To help you get the most out of your service visit, could you tell me: model year (Standard, Luxury, XPower) is your MG4? Are you experiencing specific glitches (like LKA issues or screen freezes)? Is your car due for a service
I can provide a specific list of "complaints" for you to give the dealer to ensure they install the latest patches. Despite best efforts, updates can fail
MG Motor has promised that the MG4 "Extended Range" and "XPower" models come with enhanced OTA capabilities. However, for standard models (SE and Trophy/Luxury), the industry consensus is that "partial OTA" is the reality.
Therefore, mastering the manual MG4 firmware update (or establishing a good relationship with your dealer) remains essential for 2024-2026 model owners.