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Do not download a file labeled HG6243C_V2.0.0_R01_Generic if you need an build for a locked ISP—it will reject the installation with a "Header Mismatch" error. download firmware fiberhome hg6243c exclusive
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You are likely trying to flash a generic firmware onto an ISP-locked bootloader, or the hardware versions do not match. Stop immediately and verify the file source. download firmware fiberhome hg6243c exclusive
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Enables manual configuration of SIP accounts for internet calling.