diff --git a/firmware/firmware.asm b/firmware/firmware.asm
index 0d5aa3d..b41ed15 100644
--- a/firmware/firmware.asm
+++ b/firmware/firmware.asm
@@ -2003,7 +2003,7 @@ advan1  call    showop
         defw    $ffff
         ld      a, iyl
         rrca
-        jr      c, advan1
+        jr      nc, advan1
         ld      c, $0b
         call    showop
         defw    cad96
diff --git a/firmware/strings.asm b/firmware/strings.asm
index ff35671..ead5a21 100644
--- a/firmware/strings.asm
+++ b/firmware/strings.asm
@@ -1,6 +1,6 @@
 cad0    defb    'Core:             ',0
 cad1    defm    'http://zxuno.speccy.org', 0
-        defm    'ZX-Uno BIOS v0.54', 0
+        defm    'ZX-Uno BIOS v0.55', 0
         defm    'Copyleft ', 127, ' 2016 ZX-Uno Team', 0
         defm    'Processor: Z80 3.5MHz', 0
         defm    'Memory:    512K Ok', 0
@@ -37,7 +37,7 @@ cad8    defm    $10, '                         ', $10, '              ', $10, 0
 cad9    defb    $14, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11
         defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $18, $11
         defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $15, 0
-        defb    '   BIOS v0.54    ', $7f, '2016 ZX-Uno Team', 0
+        defb    '   BIOS v0.55    ', $7f, '2016 ZX-Uno Team', 0
       IF  recovery=0
 cad10   defb    'Hardware tests', 0
         defb    $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11, $11