diff --git a/Makefile b/Makefile
index 1d487ae..79ffff3 100644
--- a/Makefile
+++ b/Makefile
@@ -76,9 +76,6 @@ bin/GWSys71_8M.bin: bin bin/baserom_romdisk_noramtest.bin disks/RDisk7M5.dsk
 	printf '\x00\x78\x00\x00' | dd of=$@ bs=1 seek=335276 count=4 conv=notrunc # Patch ROM disk size
 	# Copy ROM disk image
 	dd if=disks/RDisk7M5.dsk of=$@ bs=1024 seek=512 conv=notrunc
-	# Compute checksum
-	#python checksum.py $@ | cut -c3-10 | xxd -r -p - | dd of=$@ bs=1 seek=0 count=4 conv=notrunc
-	printf '\x36\x9D\x3E\x51' | dd of=$@ bs=1 seek=0 count=4 conv=notrunc # Insert fake checksum (BMoW)
 
 
 bin/GWSys6_4M.bin: bin bin/baserom_romdisk_noramtest.bin disks/RDisk3M5.dsk
@@ -91,9 +88,6 @@ bin/GWSys6_4M.bin: bin bin/baserom_romdisk_noramtest.bin disks/RDisk3M5.dsk
 	printf '\x00\x38\x00\x00' | dd of=$@ bs=1 seek=335276 count=4 conv=notrunc # Patch ROM disk size
 	# Copy ROM disk image
 	dd if=disks/RDisk3M5.dsk of=$@ bs=1024 seek=512 conv=notrunc
-	# Compute checksum
-	#python checksum.py $@ | cut -c3-10 | xxd -r -p - | dd of=$@ bs=1 seek=0 count=4 conv=notrunc
-	printf '\x36\x9D\x3E\x51' | dd of=$@ bs=1 seek=0 count=4 conv=notrunc # Insert fake checksum (BMoW)
 
 bin/GWSys6_8M.bin: bin/GWSys6_4M.bin
 	cat bin/GWSys6_4M.bin  > $@
@@ -110,9 +104,6 @@ bin/GWSys7Diagnostics_8M.bin: bin bin/baserom_romdisk_ramtest.bin disks/RDisk7M5
 	printf '\x00\x78\x00\x00' | dd of=$@ bs=1 seek=335276 count=4 conv=notrunc # Patch ROM disk size
 	# Copy ROM disk image
 	dd if=disks/RDisk7M5-diagnostics.dsk of=$@ bs=1024 seek=512 conv=notrunc
-	# Compute checksum
-	#python checksum.py $@ | cut -c3-10 | xxd -r -p - | dd of=$@ bs=1 seek=0 count=4 conv=notrunc
-	printf '\x36\x9D\x3E\x51' | dd of=$@ bs=1 seek=0 count=4 conv=notrunc # Insert fake checksum (BMoW)
 
 
 bin/IIxIIcxSE30/IIxIIcxSE30_512k.bin: bin/IIxIIcxSE30 roms/IIxIIcxSE30.bin
diff --git a/bin/GWSys6_4M.bin b/bin/GWSys6_4M.bin
index 160efd6..712ef30 100755
Binary files a/bin/GWSys6_4M.bin and b/bin/GWSys6_4M.bin differ
diff --git a/bin/GWSys6_8M.bin b/bin/GWSys6_8M.bin
index 241b50e..d873bfd 100644
Binary files a/bin/GWSys6_8M.bin and b/bin/GWSys6_8M.bin differ
diff --git a/bin/GWSys71_8M.bin b/bin/GWSys71_8M.bin
index 88c50ff..b47d8d8 100755
Binary files a/bin/GWSys71_8M.bin and b/bin/GWSys71_8M.bin differ
diff --git a/bin/GWSys7Diagnostics_8M.bin b/bin/GWSys7Diagnostics_8M.bin
index b8a612e..b8406e4 100755
Binary files a/bin/GWSys7Diagnostics_8M.bin and b/bin/GWSys7Diagnostics_8M.bin differ
diff --git a/bin/baserom_romdisk_noramtest.bin b/bin/baserom_romdisk_noramtest.bin
index 39402ad..0fdea4e 100755
Binary files a/bin/baserom_romdisk_noramtest.bin and b/bin/baserom_romdisk_noramtest.bin differ
diff --git a/bin/baserom_romdisk_ramtest.bin b/bin/baserom_romdisk_ramtest.bin
index 19a666b..dd44bf1 100755
Binary files a/bin/baserom_romdisk_ramtest.bin and b/bin/baserom_romdisk_ramtest.bin differ
diff --git a/roms/baserom.bin b/roms/baserom.bin
index e072710..28d1047 100755
Binary files a/roms/baserom.bin and b/roms/baserom.bin differ