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Hi there, no this isn't the correct toner for the M277dw printer.
You can find the correct toners on the following page: https://www.tonergiant.co.uk/model/HP-Colour-LaserJet-Pro-M277dw-toner-cartridges/.
For any faulty items, all you need to do is contact us and book a return and we would arrange for a courier to collect the faulty item. For original HP products, it's extremely unlikely you will ever get a faulty item (original HP are listed below and have an HP logo next to the image). We guarantee compatible cartridges for 3 years and the failure rate is less than 5% so again they are very good quality (compatible items have the TonerGiant logo next to the image). Delivery is the next working day to anywhere in the UK when orders are placed before 5:30 pm for items that are in stock. If you need any more help, please let us know.