diff -Nru bluez-5.53/debian/changelog bluez-5.53/debian/changelog
--- bluez-5.53/debian/changelog	2020-04-03 01:46:35.000000000 -0500
+++ bluez-5.53/debian/changelog	2021-03-15 14:25:22.000000000 -0500
@@ -1,3 +1,9 @@
+bluez (5.53-0ubuntu3.1) focal; urgency=medium
+
+  * Add support for the pi 400 (LP: #1903048)
+
+ -- William 'jawn-smith' Wilson <william.wilson@canonical.com>  Mon, 15 Mar 2021 19:25:22 +0000
+
 bluez (5.53-0ubuntu3) focal; urgency=medium
 
   * debian/patches/ubuntu_error_restart.patch:
diff -Nru bluez-5.53/debian/patches/raspi-bcm43xx-3wire.patch bluez-5.53/debian/patches/raspi-bcm43xx-3wire.patch
--- bluez-5.53/debian/patches/raspi-bcm43xx-3wire.patch	1969-12-31 18:00:00.000000000 -0600
+++ bluez-5.53/debian/patches/raspi-bcm43xx-3wire.patch	2021-03-15 14:25:22.000000000 -0500
@@ -0,0 +1,20 @@
+Author: Simon Long <simon@raspberrypi.org>
+Forwarded: https://patchwork.kernel.org/project/bluetooth/patch/20201218190609.107898-2-dave.jones@canonical.com/
+Last-Update: 2017-04-05
+Description: Patches to add BCM43xx 3-wire variant
+ This patch adds the bcm43xx-3wire variant to the hciattach tool; this is
+ for use when the mini-UART (which lacks flow-control) is used instead of the
+ PL011 UART to drive the bluetooth module
+
+--- a/tools/hciattach.c
++++ b/tools/hciattach.c
+@@ -1091,6 +1091,9 @@
+ 	{ "bcm43xx",    0x0000, 0x0000, HCI_UART_H4,   115200, 3000000,
+ 				FLOW_CTL, DISABLE_PM, NULL, bcm43xx, NULL  },
+ 
++	{ "bcm43xx-3wire",    0x0000, 0x0000, HCI_UART_3WIRE,   115200, 3000000,
++				0, DISABLE_PM, NULL, bcm43xx, NULL  },
++
+ 	{ "ath3k",    0x0000, 0x0000, HCI_UART_ATH3K, 115200, 115200,
+ 			FLOW_CTL, DISABLE_PM, NULL, ath3k_ps, ath3k_pm  },
+ 
diff -Nru bluez-5.53/debian/patches/raspi-bcm43xx-load-firmware.patch bluez-5.53/debian/patches/raspi-bcm43xx-load-firmware.patch
--- bluez-5.53/debian/patches/raspi-bcm43xx-load-firmware.patch	1969-12-31 18:00:00.000000000 -0600
+++ bluez-5.53/debian/patches/raspi-bcm43xx-load-firmware.patch	2021-03-15 14:25:22.000000000 -0500
@@ -0,0 +1,31 @@
+Author: Simon Long <simon@raspberrypi.org>
+Forwarded: https://patchwork.kernel.org/project/bluetooth/patch/20201218190609.107898-4-dave.jones@canonical.com/
+Last-Update: 2020-12-18
+Description: Patches for loading the bcm43xx firmware
+ This patch corrects the location of the firmware from /etc/firmware to
+ /lib/firmware, and disables setting the UART interface speed *before* loading
+ the firmware (a later call sets the speed of the interface as requested). It
+ also introduces a short wait after the firmware load before the module is
+ reset.
+
+--- a/tools/hciattach_bcm43xx.c
++++ b/tools/hciattach_bcm43xx.c
+@@ -44,7 +44,7 @@
+ #include "hciattach.h"
+ 
+ #ifndef FIRMWARE_DIR
+-#define FIRMWARE_DIR "/etc/firmware"
++#define FIRMWARE_DIR "/lib/firmware"
+ #endif
+ 
+ #define FW_EXT ".hcd"
+@@ -369,9 +369,6 @@
+ 	if (bcm43xx_locate_patch(FIRMWARE_DIR, chip_name, fw_path)) {
+ 		fprintf(stderr, "Patch not found, continue anyway\n");
+ 	} else {
+-		if (bcm43xx_set_speed(fd, ti, speed))
+-			return -1;
+-
+ 		if (bcm43xx_load_firmware(fd, fw_path))
+ 			return -1;
+ 
diff -Nru bluez-5.53/debian/patches/raspi-cypress-305-bdaddr.patch bluez-5.53/debian/patches/raspi-cypress-305-bdaddr.patch
--- bluez-5.53/debian/patches/raspi-cypress-305-bdaddr.patch	1969-12-31 18:00:00.000000000 -0600
+++ bluez-5.53/debian/patches/raspi-cypress-305-bdaddr.patch	2021-03-15 14:25:22.000000000 -0500
@@ -0,0 +1,23 @@
+From: Phil Elwell <phil@raspberrypi.com>
+Forwarded: https://patchwork.kernel.org/project/bluetooth/patch/20201218190609.107898-3-dave.jones@canonical.com/
+Subject: Patch Cypress 305 devices to behave as Broadcom devices
+
+---
+ tools/bdaddr.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/tools/bdaddr.c b/tools/bdaddr.c
+index 952e99077..55fad4b46 100644
+--- a/tools/bdaddr.c
++++ b/tools/bdaddr.c
+@@ -316,6 +316,7 @@ static struct {
+ 	{ 48,		st_write_bd_addr,	generic_reset_device	},
+ 	{ 57,		ericsson_write_bd_addr,	generic_reset_device	},
+ 	{ 72,		mrvl_write_bd_addr,	generic_reset_device	},
++	{ 305,		bcm_write_bd_addr,	generic_reset_device	},
+ 	{ 65535,	NULL,			NULL			},
+ };
+ 
+-- 
+2.25.1
+
diff -Nru bluez-5.53/debian/patches/series bluez-5.53/debian/patches/series
--- bluez-5.53/debian/patches/series	2020-04-03 01:43:11.000000000 -0500
+++ bluez-5.53/debian/patches/series	2021-03-15 14:25:22.000000000 -0500
@@ -16,3 +16,6 @@
 CVE-2020-0556-3.patch
 CVE-2020-0556-4.patch
 ubuntu_error_restart.patch
+raspi-bcm43xx-3wire.patch
+raspi-bcm43xx-load-firmware.patch
+raspi-cypress-305-bdaddr.patch