Without a remote fix, customers have needed to swap out their modems entirely for new units.
T-Mobile is investigating the issue, a spokesperson told CNET.
The update was intended to fix a separate issue of unintended reboots that had impacted the Sagemcom routers.
T-Mobile has around2.6 million home internet customers, the carrier reported for its fourth quarter 2022 earnings.
T-Mobile didn’t respond to a request for comment.
