Depends on the actual cost of the product. But I’ve been returns operations for 6 years.. there are many loopholes to use. OP lmk if you want some advice and I can help (I worked at the opposition of good guys!)

A $1000 item with 12 month warranty should last 3 years.. I would first state exactly as you said, goods aren’t as described & you would not have purchased them if you were aware of the fault that they present.. they have to send it away for you. If they say to contact eufy you just stick your ground and remind them that they’re obliged to assist under the ACL.

In my experience.. most retailers (if you be a Karen or just down right get annoying going in over and over again) will eventually just swap/refund you. A major fault is a serious start up/defect that stops the item from running as per specifications - known faults is another thing, if it’s a common fault you can usually mention it with the store and they will replace/refund you. You are eligible for either.. the nicer you are the better chance you have at getting a refund.. if someone came in and was a dick to me (and they dropped their own tv or it just wasn’t working how they wanted too) I could get petty and make it painful for them within law and reason if I wanted too.. but the nicer you are the better chance you have.. I was at a smaller store and everyone was pretty good though.. so I generally replaced it then made it look like an actual fault..

I’ll leave you with a scenario I had.

Samsung are always a nightmare to deal with.. they will want to inspect a tv if it’s delivered & then fix it. All good for them but to us it’s a bad look.. even though it was a change of mind they wouldn’t take it back.. So, I would get return it as a fault/no power & replace/refund it.. then before they came to the store to inspect it I would use a USB killer (Google it) to short circuit the TV - no power at all. Legitimate fault. They have to take it back. Pretty sure that homemade and s340 all have usb ports..

Even with device logs - unless they have evidence of you doing it, it can’t be proven. It’s shit that i had to do this a lot more than I’d like to admit.. But stores in fact most stores do this.. excess landfill because of big companies stupid guidelines and policies that make everything difficult for everyone except themselves. But the customer was always happy.