This is common if you are using an older version of the tool. Ensure you have the latest version, or check your firewall settings to allow the B2C Client access to the internet.
If the tool hangs or asks for the client repeatedly, some users utilize Windows Enabler to bypass UI locks within the flashing software. please install csmg b2c client tool free
While many third-party sites host "free" versions of this tool, it is safest to look for official legacy support mirrors if they are still active. Here is the standard installation workflow: This is common if you are using an older version of the tool