EasyBCD does exactly what you tell it to do.
It can't touch your system unless you instruct it to do something.
Several million users world-wide testify to its efficacy.
I suggest you read how to use it (it's pretty simple compared to the MS alternative) and then maybe you'll find out how you managed to damage your PC. EasyBCD Basics
Like regedit, it has power tool capabilities, but you shouldn't use either "experimentally" if you don't appreciate what it is you're trying to do and how to do it.
Unlike regedit, EasyBCD will actually warn you in some circumstances that you are about to destroy your ongoing ability to boot the PC if you don't take further action before attempting to reboot, despite which warning (in big scary letters), many have pressed on regardless and then come here to complain "It broke my PC"
Strange how nobody ever complains to MS that regedit "broke the registry".