C++ :: Write Process Memory Bytes

Writing bytes to external process to remove a detour that the program does

this is what im trying it fails

HANDLE Handle = OpenProcess(PROCESS_ALL_ACCESS, false, ProcessId);

BYTE btLdrLoadDll[] = { 0x8B, 0xFF, 0x55, 0x8B, 0xEC };

if (!WriteProcessMemory(Handle, (BYTE*)((DWORD)GetProcAddress(GetModuleHandle("ntdll.dll"), "LdrLoadDll")), &btLdrLoadDll, sizeof(btLdrLoadDll), NULL)) {
CloseHandle(Handle);
std::cout << "
Failed to write Bytes to memory. Press enter to exit.";

[Code] ....

an also using the right address like this fails

WriteProcessMemory(Handle, (BYTE*)0x77C64F9F, &btLdrLoadDll, sizeof(btLdrLoadDll), NULL)