Sony Xperia 5 IV SOG09 (Japanese KDDI): diagnosis and tested fixes for 5G not working, 5G SA not registering, n28 20 MHz, Yes/YTL MBN selection and VoNR call failures in Malaysia. EFS procedures, IMS analysis and offline signalling tools. Root required; limitations documented.
android root sony-xperia efs qualcomm ims malaysia 5g kddi volte mbn vonr 5g-sa n78 xperia-5-iv sog09 n28 yes-5g
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Updated
Nov 1, 2026