diff --git a/Makefile b/Makefile
index 858df44..ddeddc3 100644
--- a/Makefile
+++ b/Makefile
@@ -183,7 +183,9 @@ $(shell touch $(CURDIR)/../$(SOURCES)/version.h)
 %.gba: %.elf
 	@$(OBJCOPY) -O binary $< $@
 	@gbafix $@ "-tLK MULTIMENU" "-cAGBJ" "-mLK" "-r0"
+	@echo Copying to ROM builder folder
 	@cp $@ "$(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))/rom_builder/lk_multimenu.gba"
+	@echo Done!
 
 #---------------------------------------------------------------------------------------
 endif
diff --git a/README.md b/README.md
index e3449c1..aece7ce 100644
--- a/README.md
+++ b/README.md
@@ -20,8 +20,9 @@ The following section must be edited in order to specify the cartridge type to u
 },
 ```
 Set `type` to `1` or `2`:
-- `1` = MSP55LV100S (e.g. The Legend of Zelda Collection - Classic Edition 7-in-1)
-- `2` = 6600M0U0BE (e.g. 369IN1 2048M)
+- `1` = MSP55LV100S (e.g. The Legend of Zelda Collection - Classic Edition 7-in-1, 64 MiB)
+- `2` = 6600M0U0BE (e.g. 369IN1 2048M, 256 MiB)
+- `3` = MSP54LV100 (e.g. The Legend of Zelda Collection - Classic Edition 7-in-1, 128 MiB)
 
 Set `battery_present` to `true` or `false`. This will enable enhanced save data handling which will only be functional with a working battery.
 
@@ -76,13 +77,14 @@ If the cartridge has no battery installed, the ROMs must be patched for batteryl
 
 ## Compatibility
 Tested repro cartridges:
-- 100BS6600_48BALL_V4 with 6600M0U0BE
 - 100SOP with MSP55LV100S
+- 100BS6600_48BALL_V4 with 6600M0U0BE
+- SUN100S_MSP54_XXX_BGA48 with MSP54LV100
 
 The generated compilation ROM can be written and read using a [GBxCart RW v1.4+](https://www.gbxcart.com/) device by insideGadgets and the [FlashGBX](https://github.com/lesserkuma/FlashGBX) software.
 
 ## Thanks
-Thanks to FraX, Ausar, liuyunx, BennVenn
+Thanks to FraX, Ausar, liuyunx, BennVenn, Jenetrix
 
 ## Screenshots
 
diff --git a/rom_builder/rom_builder.py b/rom_builder/rom_builder.py
index 3774b8a..8d28d62 100644
--- a/rom_builder/rom_builder.py
+++ b/rom_builder/rom_builder.py
@@ -5,7 +5,7 @@
 import sys, os, glob, json, math, re, struct, hashlib, argparse, datetime
 
 # Configuration
-app_version = "0.7"
+app_version = "0.8"
 default_file = "LK_MULTIMENU_<CODE>.gba"
 
 ################################
@@ -51,6 +51,12 @@ cartridge_types = [
 		"sector_size":0x40000,
 		"block_size":0x80000,
 	},
+	{
+		"name":"MSP54LV100",
+		"flash_size":0x8000000,
+		"sector_size":0x20000,
+		"block_size":0x80000,
+	},
 ]
 now = datetime.datetime.now()
 log = ""
diff --git a/source/flash.c b/source/flash.c
index ff4e59b..5f50709 100644
--- a/source/flash.c
+++ b/source/flash.c
@@ -66,6 +66,22 @@ IWRAM_CODE void FlashDetectType(void)
 		return;
 	}
 
+	// 1G cart with MSP54LV100S (Zelda Classic Collection 7-in-1)
+	_FLASH_WRITE(0, 0xF0);
+	_FLASH_WRITE(0xAAA, 0xA9);
+	_FLASH_WRITE(0x555, 0x56);
+	_FLASH_WRITE(0xAAA, 0x90);
+	data = *(vu32 *)AGB_ROM;
+	_FLASH_WRITE(0, 0xF0);
+	if (data == 0x227D0002)
+	{
+		REG_IE = ie;
+		flash_type = 3;
+		flash_sector_size = 0x20000;
+		FlashCalcOffsets();
+		return;
+	}
+
 	// Unknown type
 	REG_IE = ie;
 	flash_type = 0;
@@ -119,6 +135,24 @@ IWRAM_CODE void FlashEraseSector(u32 address)
 		}
 		_FLASH_WRITE(address, 0xF0F0);
 	}
+	else if (_flash_type == 3)
+	{
+		_FLASH_WRITE(0xAAA, 0xA9);
+		_FLASH_WRITE(0x555, 0x56);
+		_FLASH_WRITE(0xAAA, 0x80);
+		_FLASH_WRITE(0xAAA, 0xA9);
+		_FLASH_WRITE(0x555, 0x56);
+		_FLASH_WRITE(address, 0x30);
+		while (1)
+		{
+			__asm("nop");
+			if ((*((vu16 *)(AGB_ROM + address))) == 0xFFFF)
+			{
+				break;
+			}
+		}
+		_FLASH_WRITE(address, 0xF0);
+	}
 
 	REG_IE = ie;
 }
@@ -191,6 +225,33 @@ IWRAM_CODE void FlashWriteData(u32 address, u32 length)
 		}
 		_FLASH_WRITE(address, 0xF0F0);
 	}
+	else if (_flash_type == 3)
+	{
+		for (int j = 0; j < (int)(length / 0x40); j++)
+		{
+			_FLASH_WRITE(0xAAA, 0xA9);
+			_FLASH_WRITE(0x555, 0x56);
+			_FLASH_WRITE(address + (j * 0x40), 0x26);
+			_FLASH_WRITE(address + (j * 0x40), 0x1F);
+			u16 data = 0;
+			for (int i = 0; i < 0x40; i += 2)
+			{
+				__asm("nop");
+				data = data_buffer[(j * 0x40) + i + 1] << 8 | data_buffer[(j * 0x40) + i];
+				_FLASH_WRITE(address + (j * 0x40) + i, data);
+			}
+			_FLASH_WRITE(address + (j * 0x40), 0x2A);
+			while (1)
+			{
+				__asm("nop");
+				if (p_rom[(j * 0x20) + 0x1F] == data)
+				{
+					break;
+				}
+			}
+		}
+		_FLASH_WRITE(address, 0xF0);
+	}
 
 	REG_IE = ie;
 }