: While holding the keys, connect the phone to your computer via a USB cable.
Obtain the correct firmware package (often named something like C3520XXLD1_OXELD1.zip Configure the Loader: Flash Loader 7.5.4 , click on "SET MODEL," and select the C3520_Citrus_Lite_Value_Setting_v02.mdl Load Files: c3520 flash loader 75 4 csc v02 citrus 218l link