diff --git a/src/mame/drivers/naomi.cpp b/src/mame/drivers/naomi.cpp
index 7c675fd9100..8a3f18f06f9 100644
--- a/src/mame/drivers/naomi.cpp
+++ b/src/mame/drivers/naomi.cpp
@@ -3510,15 +3510,15 @@ USA, Korea and Australia is missing.
 EPR-23605B - NAOMI BOOT ROM 2001 09/10  1.70 (Japan)
 EPR-23607B - NAOMI BOOT ROM 2001 09/10  1.70 (USA)
 EPR-23608B - NAOMI BOOT ROM 2001 09/10  1.70 (Export)
-Korea and Australia is missing.
+EPR-23609B - NAOMI BOOT ROM 2001 09/10  1.70 (Korea)
+Australia is missing.
 
 EPR-23605C - NAOMI BOOT ROM 2002 07/08  1.8- (Japan)
 EPR-23607C - NAOMI BOOT ROM 2002 07/08  1.8- (USA)
 EPR-23608C - NAOMI BOOT ROM 2002 07/08  1.8- (Export)
-USA, Korea and Australia is missing.
+Korea and Australia is missing.
 
 EPR-21604  - No known dumps (Development BOOT ROM)
-EPR-?????  - No known dumps (Korea)
 EPR-?????  - No known dumps (Australia)
 
 EPR-23605B, EPR-23607B & EPR-23608B all differ by 8 bytes:
@@ -3560,9 +3560,11 @@ Region byte encoding is as follows:
 	ROM_SYSTEM_BIOS( 9, "bios9", "epr-23607b (USA)" ) \
 	ROM_LOAD16_WORD_SWAP_BIOS( 9, "epr-23607b.ic27",   0x000000, 0x200000, CRC(f308c5e9) SHA1(5470ab1cee6afecbd8ca8cf40f8fbe4ec2cb1471) ) \
 	ROM_SYSTEM_BIOS( 10, "bios10", "epr-23607 (USA)"  ) \
-	ROM_LOAD16_WORD_SWAP_BIOS( 10, "epr-23607.ic27",    0x000000, 0x200000, CRC(2b55add2) SHA1(547de5f97d3183c8cd069c4fa3c09f13d8b637d9) ) \
-	ROM_SYSTEM_BIOS( 11, "bios11", "epr-23605c (multi-region hack)" ) \
-	ROM_LOAD16_WORD_SWAP_BIOS( 11, "epr-23605c_multi.ic27",   0x000000, 0x200000, CRC(353fdbcd) SHA1(a8b7dce572b74e02e65cb949b2c366c87625157f) )
+	ROM_LOAD16_WORD_SWAP_BIOS( 10, "epr-23607.ic27",   0x000000, 0x200000, CRC(2b55add2) SHA1(547de5f97d3183c8cd069c4fa3c09f13d8b637d9) ) \
+	ROM_SYSTEM_BIOS( 11, "bios11", "epr-23609b (Korea)"  ) \
+	ROM_LOAD16_WORD_SWAP_BIOS( 11, "epr-23609b.ic27",  0x000000, 0x200000, CRC(99e3751f) SHA1(8a244f75595c49d2a37a42ab96b6bab35163ca0e) ) \
+	ROM_SYSTEM_BIOS( 12, "bios12", "epr-23605c (multi-region hack)" ) \
+	ROM_LOAD16_WORD_SWAP_BIOS( 12, "epr-23605c_multi.ic27",   0x000000, 0x200000, CRC(353fdbcd) SHA1(a8b7dce572b74e02e65cb949b2c366c87625157f) )
 /*
    First half is BIOS, second half is game settings and is blanked/reprogrammed by the BIOS if game cartridge exchange was detected
    area 0x1A000-0x1BFFF is write protected and contain 12 bytes of unit-specific unique information (probably serial number, manufacture date, etc),