I did the upgrade on my VX520 machine back in August and following that my machine wouldn’t work. I contacted customer service and got through to an overseas advisor. After a very frustrating half an hour during which I received such advice as to “disconnect Ethernet cable and blow on each end of the cable”I was then told my cable was faulty! I refused to accept this as I had used the cable to activate the upgrade so it couldn’t be faulty. After much huffing and puffing he finally sorted the problem out. The machine now prints out a receipt for every contactless payment which it didn’t do before and at the end of day batch it itemises every sale that has been taken that day. I am wasting rolls and rolls of paper. Despite a phone call to amend this it is still the same. After many many attempts to phone over the last ten days I finally got through today after waiting over half an hour. The minute I spoke the girl cut me off!, Thank you very much for that. I hope it made you feel good.