diff --git a/Source/Core/Core/Boot/Boot.cpp b/Source/Core/Core/Boot/Boot.cpp
index 2f27bc3540..e030522369 100644
--- a/Source/Core/Core/Boot/Boot.cpp
+++ b/Source/Core/Core/Boot/Boot.cpp
@@ -572,7 +572,7 @@ bool CBoot::BootUp(Core::System& system, const Core::CPUThreadGuard& guard,
         // Because there is no TMD to get the requested system (IOS) version from,
         // we default to IOS58, which is the version used by the Homebrew Channel.
         SetupWiiMemory(system, IOS::HLE::IOSC::ConsoleType::Retail);
-        IOS::HLE::GetIOS()->BootIOS(system, Titles::IOS(58));
+        IOS::HLE::GetIOS()->BootIOS(Titles::IOS(58));
       }
       else
       {
diff --git a/Source/Core/Core/Boot/Boot_BS2Emu.cpp b/Source/Core/Core/Boot/Boot_BS2Emu.cpp
index 86c026f558..faae0e704d 100644
--- a/Source/Core/Core/Boot/Boot_BS2Emu.cpp
+++ b/Source/Core/Core/Boot/Boot_BS2Emu.cpp
@@ -559,7 +559,7 @@ bool CBoot::EmulatedBS2_Wii(Core::System& system, const Core::CPUThreadGuard& gu
   const u64 ios = ios_override >= 0 ? Titles::IOS(static_cast<u32>(ios_override)) : tmd.GetIOSId();
 
   const auto console_type = volume.GetTicket(data_partition).GetConsoleType();
-  if (!SetupWiiMemory(system, console_type) || !IOS::HLE::GetIOS()->BootIOS(system, ios))
+  if (!SetupWiiMemory(system, console_type) || !IOS::HLE::GetIOS()->BootIOS(ios))
     return false;
 
   auto di =
diff --git a/Source/Core/Core/IOS/ES/ES.cpp b/Source/Core/Core/IOS/ES/ES.cpp
index ec8a5aa5ab..128d28787f 100644
--- a/Source/Core/Core/IOS/ES/ES.cpp
+++ b/Source/Core/Core/IOS/ES/ES.cpp
@@ -374,7 +374,7 @@ bool ESDevice::LaunchIOS(u64 ios_title_id, HangPPC hang_ppc)
     const ES::TicketReader ticket = m_core.FindSignedTicket(ios_title_id);
     ES::Content content;
     if (!tmd.IsValid() || !ticket.IsValid() || !tmd.GetContent(tmd.GetBootIndex(), &content) ||
-        !GetEmulationKernel().BootIOS(GetSystem(), ios_title_id, hang_ppc,
+        !GetEmulationKernel().BootIOS(ios_title_id, hang_ppc,
                                       m_core.GetContentPath(ios_title_id, content)))
     {
       PanicAlertFmtT("Could not launch IOS {0:016x} because it is missing from the NAND.\n"
@@ -385,7 +385,7 @@ bool ESDevice::LaunchIOS(u64 ios_title_id, HangPPC hang_ppc)
     return true;
   }
 
-  return GetEmulationKernel().BootIOS(GetSystem(), ios_title_id, hang_ppc);
+  return GetEmulationKernel().BootIOS(ios_title_id, hang_ppc);
 }
 
 s32 ESDevice::WriteLaunchFile(const ES::TMDReader& tmd, Ticks ticks)
@@ -490,8 +490,7 @@ bool ESDevice::LaunchPPCTitle(u64 title_id)
 
 bool ESDevice::BootstrapPPC()
 {
-  const bool result =
-      GetEmulationKernel().BootstrapPPC(GetSystem(), m_pending_ppc_boot_content_path);
+  const bool result = GetEmulationKernel().BootstrapPPC(m_pending_ppc_boot_content_path);
   m_pending_ppc_boot_content_path = {};
   return result;
 }
diff --git a/Source/Core/Core/IOS/IOS.cpp b/Source/Core/Core/IOS/IOS.cpp
index cb324e16ed..ae56e0fe73 100644
--- a/Source/Core/Core/IOS/IOS.cpp
+++ b/Source/Core/Core/IOS/IOS.cpp
@@ -434,7 +434,7 @@ static std::vector<u8> ReadBootContent(FSCore& fs, const std::string& path, size
 
 // This corresponds to syscall 0x41, which loads a binary from the NAND and bootstraps the PPC.
 // Unlike 0x42, IOS will set up some constants in memory before booting the PPC.
-bool EmulationKernel::BootstrapPPC(Core::System& system, const std::string& boot_content_path)
+bool EmulationKernel::BootstrapPPC(const std::string& boot_content_path)
 {
   // Seeking and processing overhead is ignored as most time is spent reading from the NAND.
   u64 ticks = 0;
@@ -453,11 +453,11 @@ bool EmulationKernel::BootstrapPPC(Core::System& system, const std::string& boot
   if (dol.IsAncast())
     INFO_LOG_FMT(IOS, "BootstrapPPC: Loading ancast image");
 
-  if (!dol.LoadIntoMemory(system))
+  if (!dol.LoadIntoMemory(m_system))
     return false;
 
   INFO_LOG_FMT(IOS, "BootstrapPPC: {}", boot_content_path);
-  system.GetCoreTiming().ScheduleEvent(ticks, s_event_finish_ppc_bootstrap, dol.IsAncast());
+  m_system.GetCoreTiming().ScheduleEvent(ticks, s_event_finish_ppc_bootstrap, dol.IsAncast());
   return true;
 }
 
@@ -508,7 +508,7 @@ static constexpr SystemTimers::TimeBaseTick GetIOSBootTicks(u32 version)
 // Passing a boot content path is optional because we do not require IOSes
 // to be installed at the moment. If one is passed, the boot binary must exist
 // on the NAND, or the call will fail like on a Wii.
-bool EmulationKernel::BootIOS(Core::System& system, const u64 ios_title_id, HangPPC hang_ppc,
+bool EmulationKernel::BootIOS(const u64 ios_title_id, HangPPC hang_ppc,
                               const std::string& boot_content_path)
 {
   // IOS suspends regular PPC<->ARM IPC before loading a new IOS.
@@ -525,7 +525,7 @@ bool EmulationKernel::BootIOS(Core::System& system, const u64 ios_title_id, Hang
       return false;
 
     ElfReader elf{binary.GetElf()};
-    if (!elf.LoadIntoMemory(system, true))
+    if (!elf.LoadIntoMemory(m_system, true))
       return false;
   }
 
@@ -534,12 +534,12 @@ bool EmulationKernel::BootIOS(Core::System& system, const u64 ios_title_id, Hang
 
   if (Core::IsRunningAndStarted())
   {
-    system.GetCoreTiming().ScheduleEvent(GetIOSBootTicks(GetVersion()), s_event_finish_ios_boot,
-                                         ios_title_id);
+    m_system.GetCoreTiming().ScheduleEvent(GetIOSBootTicks(GetVersion()), s_event_finish_ios_boot,
+                                           ios_title_id);
   }
   else
   {
-    FinishIOSBoot(system, ios_title_id);
+    FinishIOSBoot(m_system, ios_title_id);
   }
 
   return true;
diff --git a/Source/Core/Core/IOS/IOS.h b/Source/Core/Core/IOS/IOS.h
index 4581e146c2..e3ebbfb99e 100644
--- a/Source/Core/Core/IOS/IOS.h
+++ b/Source/Core/Core/IOS/IOS.h
@@ -177,8 +177,8 @@ public:
   void SetGidForPPC(u16 gid);
   u16 GetGidForPPC() const;
 
-  bool BootstrapPPC(Core::System& system, const std::string& boot_content_path);
-  bool BootIOS(Core::System& system, u64 ios_title_id, HangPPC hang_ppc = HangPPC::No,
+  bool BootstrapPPC(const std::string& boot_content_path);
+  bool BootIOS(u64 ios_title_id, HangPPC hang_ppc = HangPPC::No,
                const std::string& boot_content_path = {});
   void InitIPC();