hello guys
here is the download firmware for HTM M3:
http://www.mediafire.com/download/izhv517739qujl1/M3.zip
the flash tool is the same as GT72:
http://www.mediafire.com/view/1k79kwoe52bgqg4/GT72_SP_Flash_Tool_v3.1316.0.148.rar
steps are same as the method below:
http://www.mediafire.com/download/eunzf353kuf007j/G4-tool_and_driver.zip
good luck