Have you installed H612SP1C00? Let us know if your 5G speeds improved in the comments below.
If your device is stuck on an old version and OTA fails, the official recommendation is to contact Huawei Customer Service or visit an authorized service center for a manual flash. HUAWEI Global contact details for a Huawei Service Center in your specific region? huawei h122373 firmware 10051h612sp1c00 universal link
: The crucial Global/Universal Cust Code . Unlike carrier-customized builds (such as C1217 for EE or C1367 for Three UK), C00 represents an unbranded, open-market firmware configuration entirely free of mobile operator limitations. Core Enhancements & System Stability Fixed Have you installed H612SP1C00
The exact update method depends on the source of your firmware file. The two most common methods are: HUAWEI Global contact details for a Huawei Service
The code C00 typically indicates a "universal" or global version not tied to a specific mobile provider, whereas codes like C1133 or C983 often denote ISP-customized versions.
Huawei H122-373 Firmware 10.0.5.1(H612SP1C00): The Ultimate Universal Guide