From a424b252637fab772ddcdc6a8405247fbaecff35 Mon Sep 17 00:00:00 2001
From: TY <47445484+R-YaTian@users.noreply.github.com>
Date: Sun, 4 Jan 2026 23:13:24 +0800
Subject: [PATCH] Impl `HandleiQueRegionFreePatching` to bypass region locking
 on certain iQue games (#83)

---
 arm7/source/loader/NdsLoader.cpp | 10 ++++++++++
 arm7/source/loader/NdsLoader.h   |  1 +
 2 files changed, 11 insertions(+)

diff --git a/arm7/source/loader/NdsLoader.cpp b/arm7/source/loader/NdsLoader.cpp
index 7709061..ae13753 100644
--- a/arm7/source/loader/NdsLoader.cpp
+++ b/arm7/source/loader/NdsLoader.cpp
@@ -220,6 +220,7 @@ void NdsLoader::Load(BootMode bootMode)
     if (bootMode == BootMode::Normal)
     {
         bootType = _romHeader.IsDsiWare() ? BOOT_TYPE_NAND : BOOT_TYPE_CARD;
+        HandleIQueRegionFreePatching();
     }
     else if (bootMode == BootMode::Multiboot)
     {
@@ -1013,6 +1014,15 @@ bool NdsLoader::TryDecryptSecureArea()
     return true;
 }
 
+void NdsLoader::HandleIQueRegionFreePatching()
+{
+    if ((_romHeader.flags & 0x80) == 0x80)
+    {
+        _romHeader.flags &= ~0x80;
+        _romHeader.headerCrc = swi_getCrc16(0xFFFF, (void*)&_romHeader, 0x15E);
+    }
+}
+
 ConsoleRegion NdsLoader::GetRomRegion(u32 gameCode)
 {
     u8 gameRegionCode = (gameCode >> 24) & 0xFF;
diff --git a/arm7/source/loader/NdsLoader.h b/arm7/source/loader/NdsLoader.h
index 14bd17a..663cc52 100644
--- a/arm7/source/loader/NdsLoader.h
+++ b/arm7/source/loader/NdsLoader.h
@@ -73,6 +73,7 @@ private:
     void InsertArgv();
     bool TrySetupDsiWareSave();
     bool TryDecryptSecureArea();
+    void HandleIQueRegionFreePatching();
     ConsoleRegion GetRomRegion(u32 gameCode);
     UserLanguage GetLanguageByRomRegion(ConsoleRegion romRegion);
     u32 GetSupportedLanguagesByRegion(ConsoleRegion region);