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add warning against hacked firmware dumps

This commit is contained in:
Arisotura 2019-11-08 21:55:13 +01:00
parent c064f738ea
commit 3f7bc1a6c1
1 changed files with 39 additions and 0 deletions
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39
src/libui_sdl/main.cpp
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@ -2664,6 +2664,45 @@ int main(int argc, char** argv)
SDL_Quit();
return 0;
}
if (!Platform::LocalFileExists("firmware.bin.bak"))
{
// verify the firmware
//
// there are dumps of an old hacked firmware floating around on the internet
// and those are problematic
// the hack predates WFC, and, due to this, any game that alters the WFC
// access point data will brick that firmware due to it having critical
// data in the same area. it has the same problem on hardware.
//
// but this should help stop users from reporting that issue over and over
// again, when the issue is not from melonDS but from their firmware dump.
//
// I don't know about all the firmware hacks in existence, but the one I
// looked at has 0x180 bytes from the header repeated at 0x3FC80, but
// bytes 0x0C-0x14 are different.
FILE* f = Platform::OpenLocalFile("firmware.bin", "rb");
u8 chk1[0x180], chk2[0x180];
fseek(f, 0, SEEK_SET);
fread(chk1, 1, 0x180, f);
fseek(f, -0x380, SEEK_END);
fread(chk2, 1, 0x180, f);
memset(&chk1[0x0C], 0, 8);
memset(&chk2[0x0C], 0, 8);
fclose(f);
if (!memcmp(chk1, chk2, 0x180))
{
uiMsgBoxError(NULL,
"Problematic firmware dump",
"You are using an old hacked firmware dump.\n"
"Firmware boot will stop working if you run any game that alters WFC settings.\n\n"
"Note that the issue is not from melonDS, it would also happen on an actual DS.");
}
}
{
FILE* f = Platform::OpenLocalFile("romlist.bin", "rb");
if (f)