diff --git a/Source/Core/Core/IOS/ES/ES.cpp b/Source/Core/Core/IOS/ES/ES.cpp
index a8d72b96a8..ef3864bcf8 100644
--- a/Source/Core/Core/IOS/ES/ES.cpp
+++ b/Source/Core/Core/IOS/ES/ES.cpp
@@ -158,6 +158,21 @@ IPCCommandResult ES::GetTitleID(const IOCtlVRequest& request)
   return GetDefaultReply(IPC_SUCCESS);
 }
 
+static bool UpdateUIDAndGID(const IOS::ES::TMDReader& tmd)
+{
+  IOS::ES::UIDSys uid_sys{Common::FromWhichRoot::FROM_SESSION_ROOT};
+  const u64 title_id = tmd.GetTitleId();
+  const u32 uid = uid_sys.GetOrInsertUIDForTitle(title_id);
+  if (!uid)
+  {
+    ERROR_LOG(IOS_ES, "Failed to get UID for title %016" PRIx64, title_id);
+    return false;
+  }
+  SetUIDForPPC(uid);
+  SetGIDForPPC(tmd.GetGroupId());
+  return true;
+}
+
 IPCCommandResult ES::SetUID(const IOCtlVRequest& request)
 {
   if (!request.HasNumberOfValidVectors(1, 0))
@@ -226,6 +241,16 @@ bool ES::LaunchPPCTitle(u64 title_id, bool skip_reload)
   s_title_context.Update(content_loader);
   INFO_LOG(IOS_ES, "LaunchPPCTitle: Title context changed: %016" PRIx64,
            s_title_context.tmd.GetTitleId());
+
+  // Note: the UID/GID is also updated for IOS titles, but since we have no guarantee IOS titles
+  // are installed, we can only do this for PPC titles.
+  if (!UpdateUIDAndGID(s_title_context.tmd))
+  {
+    s_title_context.Clear();
+    INFO_LOG(IOS_ES, "LaunchPPCTitle: Title context changed: (none)");
+    return false;
+  }
+
   return BootstrapPPC(content_loader);
 }
 
@@ -533,6 +558,9 @@ s32 ES::DIVerify(const IOS::ES::TMDReader& tmd, const IOS::ES::TicketReader& tic
   if (tmd.GetTitleId() != ticket.GetTitleId())
     return ES_EINVAL;
 
+  s_title_context.Update(tmd, ticket);
+  INFO_LOG(IOS_ES, "ES_DIVerify: Title context changed: %016" PRIx64, tmd.GetTitleId());
+
   std::string tmd_path = Common::GetTMDFileName(tmd.GetTitleId(), Common::FROM_SESSION_ROOT);
 
   File::CreateFullPath(tmd_path);
@@ -545,14 +573,15 @@ s32 ES::DIVerify(const IOS::ES::TMDReader& tmd, const IOS::ES::TicketReader& tic
     if (!tmd_file.WriteBytes(tmd_bytes.data(), tmd_bytes.size()))
       ERROR_LOG(IOS_ES, "DIVerify failed to write disc TMD to NAND.");
   }
-  IOS::ES::UIDSys uid_sys{Common::FromWhichRoot::FROM_SESSION_ROOT};
-  uid_sys.AddTitle(tmd.GetTitleId());
   // DI_VERIFY writes to title.tmd, which is read and cached inside the NAND Content Manager.
   // clear the cache to avoid content access mismatches.
   DiscIO::CNANDContentManager::Access().ClearCache();
 
-  s_title_context.Update(tmd, ticket);
-  INFO_LOG(IOS_ES, "ES_DIVerify: Title context changed: %016" PRIx64, tmd.GetTitleId());
+  if (!UpdateUIDAndGID(s_title_context.tmd))
+  {
+    return ES_SHORT_READ;
+  }
+
   return IPC_SUCCESS;
 }
 }  // namespace Device
diff --git a/Source/Core/Core/IOS/ES/Formats.cpp b/Source/Core/Core/IOS/ES/Formats.cpp
index e4da96e2d0..d57bffb460 100644
--- a/Source/Core/Core/IOS/ES/Formats.cpp
+++ b/Source/Core/Core/IOS/ES/Formats.cpp
@@ -446,11 +446,11 @@ UIDSys::UIDSys(Common::FromWhichRoot root)
 
   if (m_entries.empty())
   {
-    AddTitle(TITLEID_SYSMENU);
+    GetOrInsertUIDForTitle(TITLEID_SYSMENU);
   }
 }
 
-u32 UIDSys::GetUIDFromTitle(u64 title_id)
+u32 UIDSys::GetUIDFromTitle(u64 title_id) const
 {
   const auto it = std::find_if(m_entries.begin(), m_entries.end(),
                                [title_id](const auto& entry) { return entry.second == title_id; });
@@ -464,26 +464,33 @@ u32 UIDSys::GetNextUID() const
   return m_entries.rbegin()->first + 1;
 }
 
-void UIDSys::AddTitle(u64 title_id)
+u32 UIDSys::GetOrInsertUIDForTitle(const u64 title_id)
 {
-  if (GetUIDFromTitle(title_id))
+  const u32 current_uid = GetUIDFromTitle(title_id);
+  if (current_uid)
   {
     INFO_LOG(IOS_ES, "Title %016" PRIx64 " already exists in uid.sys", title_id);
-    return;
+    return current_uid;
   }
 
-  u32 uid = GetNextUID();
+  const u32 uid = GetNextUID();
   m_entries.insert({uid, title_id});
 
   // Byte swap before writing.
-  title_id = Common::swap64(title_id);
-  uid = Common::swap32(uid);
+  const u64 swapped_title_id = Common::swap64(title_id);
+  const u32 swapped_uid = Common::swap32(uid);
 
   File::CreateFullPath(m_file_path);
   File::IOFile file(m_file_path, "ab");
 
-  if (!file.WriteBytes(&title_id, sizeof(title_id)) || !file.WriteBytes(&uid, sizeof(uid)))
+  if (!file.WriteBytes(&swapped_title_id, sizeof(title_id)) ||
+      !file.WriteBytes(&swapped_uid, sizeof(uid)))
+  {
     ERROR_LOG(IOS_ES, "Failed to write to /sys/uid.sys");
+    return 0;
+  }
+
+  return uid;
 }
 }  // namespace ES
 }  // namespace IOS
diff --git a/Source/Core/Core/IOS/ES/Formats.h b/Source/Core/Core/IOS/ES/Formats.h
index d073544ad1..691babdc9b 100644
--- a/Source/Core/Core/IOS/ES/Formats.h
+++ b/Source/Core/Core/IOS/ES/Formats.h
@@ -219,8 +219,8 @@ class UIDSys final
 public:
   explicit UIDSys(Common::FromWhichRoot root);
 
-  u32 GetUIDFromTitle(u64 title_id);
-  void AddTitle(u64 title_id);
+  u32 GetUIDFromTitle(u64 title_id) const;
+  u32 GetOrInsertUIDForTitle(u64 title_id);
   u32 GetNextUID() const;
 
 private:
diff --git a/Source/Core/Core/IOS/ES/NandUtils.cpp b/Source/Core/Core/IOS/ES/NandUtils.cpp
index 7d60f5c5e6..fd586010e5 100644
--- a/Source/Core/Core/IOS/ES/NandUtils.cpp
+++ b/Source/Core/Core/IOS/ES/NandUtils.cpp
@@ -194,7 +194,7 @@ bool InitImport(u64 title_id)
   }
 
   UIDSys uid_sys{Common::FROM_CONFIGURED_ROOT};
-  uid_sys.AddTitle(title_id);
+  uid_sys.GetOrInsertUIDForTitle(title_id);
 
   // IOS moves the title content directory to /import if the TMD exists during an import.
   if (File::Exists(Common::GetTMDFileName(title_id, Common::FROM_SESSION_ROOT)))
diff --git a/Source/Core/Core/IOS/IPC.cpp b/Source/Core/Core/IOS/IPC.cpp
index bfbcf7c4b6..00d20877f9 100644
--- a/Source/Core/Core/IOS/IPC.cpp
+++ b/Source/Core/Core/IOS/IPC.cpp
@@ -91,6 +91,9 @@ static u64 s_last_reply_time;
 
 static u64 s_active_title_id;
 
+static u32 s_ppc_uid;
+static u16 s_ppc_gid;
+
 static constexpr u64 ENQUEUE_REQUEST_FLAG = 0x100000000ULL;
 static constexpr u64 ENQUEUE_ACKNOWLEDGEMENT_FLAG = 0x200000000ULL;
 
@@ -702,6 +705,28 @@ bool Reload(const u64 ios_title_id)
   return true;
 }
 
+// Since we don't have actual processes, we keep track of only the PPC's UID/GID.
+// These functions roughly correspond to syscalls 0x2b, 0x2c, 0x2d, 0x2e (though only for the PPC).
+void SetUIDForPPC(u32 uid)
+{
+  s_ppc_uid = uid;
+}
+
+u32 GetUIDForPPC()
+{
+  return s_ppc_uid;
+}
+
+void SetGIDForPPC(u16 gid)
+{
+  s_ppc_gid = gid;
+}
+
+u16 GetGIDForPPC()
+{
+  return s_ppc_gid;
+}
+
 // 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 BootstrapPPC(const DiscIO::CNANDContentLoader& content_loader)
@@ -783,6 +808,8 @@ void DoState(PointerWrap& p)
   p.Do(s_reply_queue);
   p.Do(s_last_reply_time);
   p.Do(s_active_title_id);
+  p.Do(s_ppc_uid);
+  p.Do(s_ppc_gid);
 
   if (s_active_title_id == MIOS_TITLE_ID)
     return;
diff --git a/Source/Core/Core/IOS/IPC.h b/Source/Core/Core/IOS/IPC.h
index e35608de0c..0d9e93ad70 100644
--- a/Source/Core/Core/IOS/IPC.h
+++ b/Source/Core/Core/IOS/IPC.h
@@ -59,6 +59,11 @@ void Shutdown();
 bool Reload(u64 ios_title_id);
 u32 GetVersion();
 
+void SetUIDForPPC(u32 uid);
+u32 GetUIDForPPC();
+void SetGIDForPPC(u16 gid);
+u16 GetGIDForPPC();
+
 bool BootstrapPPC(const DiscIO::CNANDContentLoader& content_loader);
 
 // Do State
diff --git a/Source/Core/Core/State.cpp b/Source/Core/Core/State.cpp
index 28d41b5961..1d1f92cd2f 100644
--- a/Source/Core/Core/State.cpp
+++ b/Source/Core/Core/State.cpp
@@ -71,7 +71,7 @@ static Common::Event g_compressAndDumpStateSyncEvent;
 static std::thread g_save_thread;
 
 // Don't forget to increase this after doing changes on the savestate system
-static const u32 STATE_VERSION = 79;  // Last changed in PR 4981
+static const u32 STATE_VERSION = 80;  // Last changed in PR 5309
 
 // Maps savestate versions to Dolphin versions.
 // Versions after 42 don't need to be added to this list,
diff --git a/Source/Core/DiscIO/NANDContentLoader.cpp b/Source/Core/DiscIO/NANDContentLoader.cpp
index 58594d6fc5..79242d1307 100644
--- a/Source/Core/DiscIO/NANDContentLoader.cpp
+++ b/Source/Core/DiscIO/NANDContentLoader.cpp
@@ -336,7 +336,7 @@ u64 CNANDContentManager::Install_WiiWAD(const std::string& filename)
   }
 
   IOS::ES::UIDSys uid_sys{Common::FromWhichRoot::FROM_CONFIGURED_ROOT};
-  uid_sys.AddTitle(title_id);
+  uid_sys.GetOrInsertUIDForTitle(title_id);
 
   ClearCache();