diff --git a/firmware/FIRMWARE.ZX1 b/firmware/FIRMWARE.ZX1
index 5a11de1..f4e69b7 100644
Binary files a/firmware/FIRMWARE.ZX1 and b/firmware/FIRMWARE.ZX1 differ
diff --git a/firmware/FIRMWARE.ZX2 b/firmware/FIRMWARE.ZX2
index b065eef..c489189 100644
Binary files a/firmware/FIRMWARE.ZX2 and b/firmware/FIRMWARE.ZX2 differ
diff --git a/firmware/FIRMWARE.ZX3 b/firmware/FIRMWARE.ZX3
index 553afdf..9546fe1 100644
Binary files a/firmware/FIRMWARE.ZX3 and b/firmware/FIRMWARE.ZX3 differ
diff --git a/firmware/FIRMWARE.ZXD b/firmware/FIRMWARE.ZXD
index 233a612..6be80c0 100644
Binary files a/firmware/FIRMWARE.ZXD and b/firmware/FIRMWARE.ZXD differ
diff --git a/firmware/firmware.asm b/firmware/firmware.asm
index 9028f54..b11e344 100644
--- a/firmware/firmware.asm
+++ b/firmware/firmware.asm
@@ -2352,18 +2352,19 @@ rotp    call    readat0               ; read 512 bytes of entries (16 entries)
         djnz    rotp
 erfnf   ld      ix, cad78
 terror  jp      ferror
-saba
+saba    sub     'N'
+        jr      z, sab2
     IF  version=3
-        sub     'D'
+        sub     'D'-'N'
     ELSE
       IF version<3
-        sub     $30+version
+        sub     $30+version-'N'
       ELSE
-        sub     $2f+version
+        sub     $2f+version-'N'
       ENDIF
     ENDIF
         jr      nz, erfnf
-        call    testl
+sab2    call    testl
         jr      nz, erfnf             ; wrong length
         ld      l, (ix+$1a)           ; first cluster of the file
         ld      h, (ix+$1b)
@@ -2444,17 +2445,19 @@ otve    call    readata
 erfnf2  jp      erfnf
 sabe    pop     bc
         pop     hl
+        sub     'N'
+        jr      z, sab3
     IF  version=3
-        sub     'D'
+        sub     'D'-'N'
     ELSE
       IF version<3
-        sub     $30+version
+        sub     $30+version-'N'
       ELSE
-        sub     $2f+version
+        sub     $2f+version-'N'
       ENDIF
     ENDIF
         jr      nz, erfnf2
-        call    testl
+sab3    call    testl
         jr      nz, erfnf2
         ld      b, (ix+$14)
         ld      l, (ix+$1a)
diff --git a/firmware/strings.asm b/firmware/strings.asm
index 26cbcf4..ff5a158 100644
--- a/firmware/strings.asm
+++ b/firmware/strings.asm
@@ -393,8 +393,6 @@ cad115  defb    'Slot occupied, select', 0
         defb    'another or delete a', 0
         defb    'ROM to free it', 0
 cad116  defb    'Disable for', 0
-        defb    'better compa-', 0
-        defb    'tibility with', 0
         defb    'old games', 0, 0
       IF  recovery=1
 cad117  defb    'Remove jumpers', 0