@Hopskirk wrote:
can I use other firmware of another type?
No.
If you visit the support pages:
Support | NETGEAR
you can feed in your model number and find the documentation for your hardware.
It will also have any firmware and drivers for your device.
@Hopskirk wrote:
but did not fix this router.
You have a problem of some sort?
If you need more help, you might get better and quicker replies, and find other answers, over in the appropriate section for your device:
DSL Modems & Routers
