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If it is definitely a Homehub 5 and not a Homehub 4, which looks the same, you should be able to use it with out problem. Try a factory reset of the Homehub by pressing a pin into the recess button on the rear for about 20 seconds.
It won't work on its own. You would need an Openreach modem to connect it through. You can get them on ebay for about £20.
If you are still in contract you should get a replacement HH5 under warranty if it is faulty.
What happened to your present HH5. Is it possibly a power supply fault. If it is you could try the HH4 power supply.