On March 6, 2018, LG released a new software update (build TP260y) for the T-mobile LG K20 plus TP260 smartphone.
LG official also released the stock kdz firmware for the LG TP260, Now You can download the TP260 stock firmware (TP26010y_00_0208.kdz) from LG server.
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Those who are in need of the latest stock firmware for T-mobile LG K20 plus TP260 can grab it from below link:
Download T-mobile LG K20 plus (TP260) Stock kdz firmware