The phone boots up, but stays on the LG logo and doesn't do FLASH Any LG Factory ROM (kdz) WITH OFFLINE FIX - xda-developers. Stock firmwares for LG devices come in KDZ (and sometimes TOT) format. You can flash these firmwares using the LG Flashtool on a Windows. LG flash tool or KDZ flash tool developed by XDA developers and released it they come up with initial version then they release two updates with fixing errors. [B]How to Flash LG KDZ file Greater Then 1GB Offline % Tested Solution Method: Download the appropriate firmware file (link. How to Flash LG KDZ file Greater Then 1GB Offline % Tested We always here to help you to fix your smartphone problems, use. this is guide for flash KDZ file via OFFLINE afcef.org computer doesn't need connect internet like this LG G2 Stock Firmware (Go Back to Stock) method. Lg Flash Tool is the best ROM Flash Tool for any kind of LG Smart Phones. Flash Any ROM's in LG mobile phones; Fix speed bugs and errors; Save battery. If you run into a problem where LG Flashtool will stop working after installing 4% of the firmware, then here's a fix just for you. This problem.