Default LG F240L

Friends would like your help. I live in Brazil and currently have the LG F240L purchased on aliexpress, Band-based M9615A CEFWMAZM-2.0.1628 android 4.4.2, kernel 3.4.0, software F240L20f. The software is full of koreanos programs and sms only has 80 characters. How can I solve it step by step and continue using android 4.4.2?: Good: