diff --git a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
index 76d5848336..8e1c6945c1 100644
--- a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
@@ -291,18 +291,7 @@ void Wiimote::HandleWriteData(const OutputReportWriteData& wd)
     else
     {
       std::copy_n(wd.data, wd.size, m_eeprom.data.data() + address);
-
-      // Write mii data to file
-      if (address >= 0x0FCA && address < 0x12C0)
-      {
-        // TODO: Only write parts of the Mii block.
-        // TODO: Use different files for different wiimote numbers.
-        std::ofstream file;
-        File::OpenFStream(file, File::GetUserPath(D_SESSION_WIIROOT_IDX) + "/mii.bin",
-                          std::ios::binary | std::ios::out);
-        file.write((char*)m_eeprom.data.data() + 0x0FCA, 0x02f0);
-        file.close();
-      }
+      m_eeprom_dirty = true;
     }
   }
   break;
@@ -486,18 +475,6 @@ bool Wiimote::ProcessReadDataRequest()
     }
     else
     {
-      // Mii block handling:
-      // TODO: different filename for each wiimote?
-      if (m_read_request.address >= 0x0FCA && m_read_request.address < 0x12C0)
-      {
-        // TODO: Only read the Mii block parts required
-        std::ifstream file;
-        File::OpenFStream(file, (File::GetUserPath(D_SESSION_WIIROOT_IDX) + "/mii.bin").c_str(),
-                          std::ios::binary | std::ios::in);
-        file.read((char*)m_eeprom.data.data() + 0x0FCA, 0x02f0);
-        file.close();
-      }
-
       // Read memory to be sent to Wii
       std::copy_n(m_eeprom.data.data() + m_read_request.address, bytes_to_read, reply.data);
       reply.size_minus_one = bytes_to_read - 1;
diff --git a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
index fcfbdb71c3..9c7e12e485 100644
--- a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp
@@ -12,6 +12,7 @@
 
 #include "Common/CommonTypes.h"
 #include "Common/Config/Config.h"
+#include "Common/FileUtil.h"
 #include "Common/Logging/Log.h"
 #include "Common/MathUtil.h"
 #include "Common/MsgHandler.h"
@@ -77,50 +78,86 @@ void Wiimote::Reset()
   m_speaker_mute = false;
 
   // EEPROM
+  std::string eeprom_file = (File::GetUserPath(D_SESSION_WIIROOT_IDX) + "/" + GetName() + ".bin");
+  if (m_eeprom_dirty)
+  {
+    // Write out existing EEPROM
+    INFO_LOG(WIIMOTE, "Wrote EEPROM for %s", GetName().c_str());
+    std::ofstream file;
+    File::OpenFStream(file, eeprom_file, std::ios::binary | std::ios::out);
+    file.write(reinterpret_cast<char*>(m_eeprom.data.data()), EEPROM_FREE_SIZE);
+    file.close();
+
+    m_eeprom_dirty = false;
+  }
   m_eeprom = {};
 
-  // IR calibration:
-  std::array<u8, 11> ir_calibration = {
-      // Point 1
-      IR_LOW_X & 0xFF,
-      IR_LOW_Y & 0xFF,
-      // Mix
-      ((IR_LOW_Y & 0x300) >> 2) | ((IR_LOW_X & 0x300) >> 4) | ((IR_LOW_Y & 0x300) >> 6) |
-          ((IR_HIGH_X & 0x300) >> 8),
-      // Point 2
-      IR_HIGH_X & 0xFF,
-      IR_LOW_Y & 0xFF,
-      // Point 3
-      IR_HIGH_X & 0xFF,
-      IR_HIGH_Y & 0xFF,
-      // Mix
-      ((IR_HIGH_Y & 0x300) >> 2) | ((IR_HIGH_X & 0x300) >> 4) | ((IR_HIGH_Y & 0x300) >> 6) |
-          ((IR_LOW_X & 0x300) >> 8),
-      // Point 4
-      IR_LOW_X & 0xFF,
-      IR_HIGH_Y & 0xFF,
-      // Checksum
-      0x00,
-  };
-  UpdateCalibrationDataChecksum(ir_calibration, 1);
-  m_eeprom.ir_calibration_1 = ir_calibration;
-  m_eeprom.ir_calibration_2 = ir_calibration;
+  if (File::Exists(eeprom_file))
+  {
+    // Read existing EEPROM
+    std::ifstream file;
+    File::OpenFStream(file, eeprom_file, std::ios::binary | std::ios::in);
+    file.read(reinterpret_cast<char*>(m_eeprom.data.data()), EEPROM_FREE_SIZE);
+    file.close();
+  }
+  else
+  {
+    // Load some default data.
 
-  // Accel calibration:
-  // Last byte is a checksum.
-  std::array<u8, 10> accel_calibration = {
-      ACCEL_ZERO_G, ACCEL_ZERO_G, ACCEL_ZERO_G, 0, ACCEL_ONE_G, ACCEL_ONE_G, ACCEL_ONE_G, 0, 0, 0,
-  };
-  UpdateCalibrationDataChecksum(accel_calibration, 1);
-  m_eeprom.accel_calibration_1 = accel_calibration;
-  m_eeprom.accel_calibration_2 = accel_calibration;
+    // IR calibration:
+    std::array<u8, 11> ir_calibration = {
+        // Point 1
+        IR_LOW_X & 0xFF,
+        IR_LOW_Y & 0xFF,
+        // Mix
+        ((IR_LOW_Y & 0x300) >> 2) | ((IR_LOW_X & 0x300) >> 4) | ((IR_LOW_Y & 0x300) >> 6) |
+            ((IR_HIGH_X & 0x300) >> 8),
+        // Point 2
+        IR_HIGH_X & 0xFF,
+        IR_LOW_Y & 0xFF,
+        // Point 3
+        IR_HIGH_X & 0xFF,
+        IR_HIGH_Y & 0xFF,
+        // Mix
+        ((IR_HIGH_Y & 0x300) >> 2) | ((IR_HIGH_X & 0x300) >> 4) | ((IR_HIGH_Y & 0x300) >> 6) |
+            ((IR_LOW_X & 0x300) >> 8),
+        // Point 4
+        IR_LOW_X & 0xFF,
+        IR_HIGH_Y & 0xFF,
+        // Checksum
+        0x00,
+    };
+    UpdateCalibrationDataChecksum(ir_calibration, 1);
+    m_eeprom.ir_calibration_1 = ir_calibration;
+    m_eeprom.ir_calibration_2 = ir_calibration;
 
-  // TODO: Is this needed?
-  // Data of unknown purpose:
-  constexpr std::array<u8, 24> EEPROM_DATA_16D0 = {0x00, 0x00, 0x00, 0xFF, 0x11, 0xEE, 0x00, 0x00,
-                                                   0x33, 0xCC, 0x44, 0xBB, 0x00, 0x00, 0x66, 0x99,
-                                                   0x77, 0x88, 0x00, 0x00, 0x2B, 0x01, 0xE8, 0x13};
-  m_eeprom.unk_2 = EEPROM_DATA_16D0;
+    // Accel calibration:
+    // Last byte is a checksum.
+    std::array<u8, 10> accel_calibration = {
+        ACCEL_ZERO_G, ACCEL_ZERO_G, ACCEL_ZERO_G, 0, ACCEL_ONE_G, ACCEL_ONE_G, ACCEL_ONE_G, 0, 0, 0,
+    };
+    UpdateCalibrationDataChecksum(accel_calibration, 1);
+    m_eeprom.accel_calibration_1 = accel_calibration;
+    m_eeprom.accel_calibration_2 = accel_calibration;
+
+    // TODO: Is this needed?
+    // Data of unknown purpose:
+    constexpr std::array<u8, 24> EEPROM_DATA_16D0 = {
+        0x00, 0x00, 0x00, 0xFF, 0x11, 0xEE, 0x00, 0x00, 0x33, 0xCC, 0x44, 0xBB,
+        0x00, 0x00, 0x66, 0x99, 0x77, 0x88, 0x00, 0x00, 0x2B, 0x01, 0xE8, 0x13};
+    m_eeprom.unk_2 = EEPROM_DATA_16D0;
+
+    std::string mii_file = File::GetUserPath(D_SESSION_WIIROOT_IDX) + "/mii.bin";
+    if (File::Exists(mii_file))
+    {
+      // Import from the existing mii.bin file, if present
+      std::ifstream file;
+      File::OpenFStream(file, mii_file, std::ios::binary | std::ios::in);
+      file.read(reinterpret_cast<char*>(m_eeprom.mii_data_1.data()), m_eeprom.mii_data_1.size());
+      m_eeprom.mii_data_2 = m_eeprom.mii_data_1;
+      file.close();
+    }
+  }
 
   m_read_request = {};
 
@@ -245,6 +282,8 @@ Wiimote::Wiimote(const unsigned int index) : m_index(index)
 
 std::string Wiimote::GetName() const
 {
+  if (m_index == WIIMOTE_BALANCE_BOARD)
+    return "BalanceBoard";
   return fmt::format("Wiimote{}", 1 + m_index);
 }
 
diff --git a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
index 0f627e619e..1f13d29d2e 100644
--- a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
+++ b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
@@ -291,6 +291,7 @@ private:
 
   bool m_is_motion_plus_attached;
 
+  bool m_eeprom_dirty = false;
   ReadRequest m_read_request;
   UsableEEPROMData m_eeprom;