For certain functions like CSC changes on Qualcomm devices, you may need to manually enable Diagnostic Mode by dialing *#0808# and selecting DM+ADB+RNDIS . Potential Solutions and Workarounds
Samsung regularly releases security patches that fix known vulnerabilities in its software. If a device has been updated with the latest security patches, it may be more difficult or impossible to use certain exploits. samfw running exploit fail updated
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