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If a hard reboot doesn't resolve this, you may need to do a full reset on your router.
Try powering off the router fully for a minute or two (disconnect the AC power cord) and press all the buttons it has multiple times (including the on/off button, if it has one). Then see if HW acceleration is working when it boots up again.
Try powering off the router fully for a minute or two (disconnect the AC power cord) and press all the buttons it has multiple times (including the on/off button, if it has one). Then see if HW acceleration is working when it boots up again.