Build prop no permission, can't be detected by pc, I have a G3 f400s. What do I do?

[covs Miranda]

Build prop no permission cant detect by pc plss help g3 f400s

Please help me i change build prop and save without permision now im stuck in logo plss help me dont know what to do now my unit is lg g3 f400s i have no custom recovery I CANT FLASH ON TOT IT SAYS CROSS DL SW VERSION AND IN FLASHTOOL 2014 IT CANT GO ON UP TO 4% LITERALLY NO MTP:'( :'( :'( :'(