D-link DSL 2730u modem dead after wrong firmware update through wireless
Attempt to do the firmware update, again--connecting always to ethernet for firmware updates. Unfortunately, your modem may be "bricked" (unusable)--in other words, it may be time to recycle it and buy a new one.
The firmware may proved damaged--given that the incorrect firmware successfully installed (hopefully, that was prevented by the device itself--it may have output an error message or code)--or, it was installed incompletely, or the update proved corrupted.
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