diff --git a/drivers/dahdi/firmware/Makefile b/drivers/dahdi/firmware/Makefile
index 3aec364..06385dd 100644
--- a/drivers/dahdi/firmware/Makefile
+++ b/drivers/dahdi/firmware/Makefile
@@ -37,7 +37,7 @@ TE435_VERSION:=d0017
 A8A_VERSION:=1d0017
 A8B_VERSION:=1d0017
 A4A_VERSION:=a0017
-A4B_VERSION:=a0017
+A4B_VERSION:=b0017
 
 FIRMWARE_URL:=http://downloads.digium.com/pub/telephony/firmware/releases
 
diff --git a/drivers/dahdi/wcaxx-base.c b/drivers/dahdi/wcaxx-base.c
index c198a22..8d5af6b 100644
--- a/drivers/dahdi/wcaxx-base.c
+++ b/drivers/dahdi/wcaxx-base.c
@@ -3915,7 +3915,7 @@ static int wcaxx_check_firmware(struct wcaxx *wc)
 	u32 firmware_version;
 	const bool force_firmware = false;
 	const unsigned int A4A_VERSION = 0x0a0017;
-	const unsigned int A4B_VERSION = 0x0a0017;
+	const unsigned int A4B_VERSION = 0x0b0017;
 	const unsigned int A8A_VERSION = 0x1d0017;
 	const unsigned int A8B_VERSION = 0x1d0017;