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An LG G2 is a known and very well documented device, where the manufacturer does provide firmwares you can download and flash, and there's third-party custom ROMs as well. TCL and Vodafone do not, and so it's basically dead in the water. Unless their service agents can do it...£££

First of all reroot your device and then unroot it by using your rooting app I am sure it's 100% working it works for me
