I. Basic Information of the Three Firmware Packages
**MPR3_AS_AU_P4851-8W0906961EK-C8**
Chassis: C8 MLBevo Platform
Part Number: 8W0906961EK
Applicable Models: A6L, A7, A8L, Q7, Q8 (MIB3 MPR3 main unit, H26/H54 box, Overseas / Import Version)
Version: P4851
**MHI3_AS_AU_P4851-8W0906961EN-B9**
Chassis: B9 MQB Platform
Part Number: 8W0906961EN
Applicable Models: A4L / A5 / Q5L
Version: P4851
**MHI3_AS_AU_P4853_8W0906961ER-MQB**
Chassis: B9 MQB
Part Number: 8W0906961ER
Applicable Models: FAW Domestic A4L, Q5L, A5
Version: P4853
## II. Main Update Content of P4851 / P4853
### Common Optimizations (Available for all three packages)
– Fix black screen, boot stuck at logo and random reboot during driving for MIB3 main unit, improve long-running stability.
– Optimize Wireless CarPlay and Android Auto: increase the success rate of automatic connection upon vehicle start, reduce disconnection and audio delay.
– Repair bugs for Bluetooth calls and Bluetooth music, solve no sound and popping noise during audio switching for incoming calls.
– Optimize communication between infotainment unit and virtual cockpit instrument panel for more stable navigation card synchronization.
– Improve stability of WiFi hotspot and fix frequent hotspot disconnection.
– Reduce standby power consumption of main unit after engine off, lowering the risk of battery drain.
– Fix intermittent communication failure of SOS emergency call module.
### ✅ MHI3 P4853 (Exclusive Enhancements for ER China Domestic Version)
– Resolve the issue of greyed-out online services and login failure after flashing P4851 onto domestic B9 vehicles.
– Adapt to Amap offline map POI, traffic restriction and road data for China region.
– Optimize Chinese UI, fix messy code and abnormal text layout on partial Chinese menus.
– Optimize vehicle network heartbeat under China Mobile / Unicom network environment, reduce 4G disconnection probability.
– Fix unique communication bugs between infotainment and body ECU on domestic B9 models.
III. Critical Distinction & Flashing Risks (Most Important)
– SFD2 Anti-theft Lock: MIB3 main units manufactured after 2022 are equipped with SFD2 lock. SFD authorization is required before flashing; upgrade cannot be completed without authorization.
– Hardware Limitation: Only compatible with H26/H54 multimedia box; old H12 MIB3 is not supported.
– Flashing Environment: Shift to P gear with stabilized battery voltage. Power cut is strictly forbidden during flashing; a single package takes 40~70 minutes to finish.
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