Select the desired FTF file and follow the on-screen prompts to begin the process.
: In versions 0.9.19.10 and older (including 0.9.18), users must be extremely careful not to untick the SIMLOCK option in the "MiscTA Exclude" pane. Unticking it can lead to permanent network locks or other critical device issues.
wayback machine from launchpad.net or androidmtk.com circa 2016.