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Bought a used ZTE 835 at a store in SD and was told it was unlocked. Arrived in Scotland, bought a giffgaff package, inserted the SIM and the phone was locked to ATT due to a 6 month contract not being paid out. Worked with ATT live chat and was able to get the phone unlocked but now it will not connect to the network. Took it to a phone repair place where the owner put the sim out of his personal phone in my phone and still no network connection. I would like to make one last try and update the system software but I do not know how to go about it. It is currently on android version 7.1.1.
The only update ability seems to be AT&T Software Update but it says the phone is up to date. Any ideas?