How have you been trying to update modem firmware? Are you using the WebUI firmware update page or another method? Could you please describe the steps you have been taking?
A new firmware version, 7.07, is available. Could you please try upgrading your device to it? If possible, perform the upgrade without keeping the settings. Afterward, please attempt to update the modem firmware.
I apologize for any confusion. Firmware updates roll out at different times. Please be patient, as it will be available soon.
If you don’t have extensive configuration on your router, or if you can take a backup, you can reset your router to factory settings and then try updating the modem again. This should remove any unknown obstacles that may have interfered with the modem update process.