diff --git a/device/base/features.cc b/device/base/features.cc
index 2565670c9b67a..2af045bec3eb7 100644
--- a/device/base/features.cc
+++ b/device/base/features.cc
@@ -41,7 +41,7 @@ BASE_FEATURE(kUncachedGattDiscoveryForGattConnection,
 // Serial.
 BASE_FEATURE(kBluetoothRfcommAndroid,
              "BluetoothRfcommAndroid",
-             base::FEATURE_DISABLED_BY_DEFAULT);
+             base::FEATURE_ENABLED_BY_DEFAULT);
 #endif  // BUILDFLAG(IS_ANDROID)
 
 #if BUILDFLAG(IS_ANDROID)
diff --git a/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any-expected.txt b/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any-expected.txt
index a03b903bc0e1e..bf166f0dc7478 100644
--- a/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any-expected.txt
+++ b/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any-expected.txt
@@ -1,75 +1,5 @@
 This is a testharness.js-based test.
-Found 36 FAIL, 0 TIMEOUT, 0 NOTRUN.
-[FAIL] Serial interface: existence and properties of interface object
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface object length
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface object name
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: existence and properties of interface prototype object
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: existence and properties of interface prototype object's "constructor" property
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: existence and properties of interface prototype object's @@unscopables property
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: attribute onconnect
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: attribute ondisconnect
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: operation getPorts()
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: operation requestPort(optional SerialPortRequestOptions)
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial must be primary interface of navigator.serial
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Stringification of navigator.serial
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must inherit property "onconnect" with the proper type
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must inherit property "ondisconnect" with the proper type
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must inherit property "getPorts()" with the proper type
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must inherit property "requestPort(optional SerialPortRequestOptions)" with the proper type
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: calling requestPort(optional SerialPortRequestOptions) on navigator.serial with too few arguments must throw TypeError
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] SerialPort interface: existence and properties of interface object
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface object length
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface object name
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: existence and properties of interface prototype object
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: existence and properties of interface prototype object's "constructor" property
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: existence and properties of interface prototype object's @@unscopables property
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute onconnect
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute ondisconnect
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
+Found 1 FAIL, 0 TIMEOUT, 0 NOTRUN.
 [FAIL] SerialPort interface: attribute connected
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute readable
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute writable
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation getInfo()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation open(SerialOptions)
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation setSignals(optional SerialOutputSignals)
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation getSignals()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation close()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation forget()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] Navigator interface: attribute serial
-  assert_true: The prototype object must have a property "serial" expected true got false
-[FAIL] Navigator interface: navigator must inherit property "serial" with the proper type
-  assert_inherits: property "serial" not found in prototype chain
+  assert_true: The prototype object must have a property "connected" expected true got false
 Harness: the test ran to completion.
diff --git a/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any.worker-expected.txt b/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any.worker-expected.txt
index eb94372719255..bf166f0dc7478 100644
--- a/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any.worker-expected.txt
+++ b/third_party/blink/web_tests/platform/android/external/wpt/serial/idlharness.https.any.worker-expected.txt
@@ -1,73 +1,5 @@
 This is a testharness.js-based test.
-Found 35 FAIL, 0 TIMEOUT, 0 NOTRUN.
-[FAIL] Serial interface: existence and properties of interface object
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface object length
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface object name
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: existence and properties of interface prototype object
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: existence and properties of interface prototype object's "constructor" property
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: existence and properties of interface prototype object's @@unscopables property
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: attribute onconnect
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: attribute ondisconnect
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: operation getPorts()
-  assert_own_property: self does not have own property "Serial" expected property "Serial" missing
-[FAIL] Serial interface: member requestPort
-  Cannot use 'in' operator to search for 'requestPort' in undefined
-[FAIL] Serial must be primary interface of navigator.serial
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Stringification of navigator.serial
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must inherit property "onconnect" with the proper type
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must inherit property "ondisconnect" with the proper type
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must inherit property "getPorts()" with the proper type
-  assert_equals: wrong typeof object expected "object" but got "undefined"
-[FAIL] Serial interface: navigator.serial must not have property "requestPort"
-  Cannot use 'in' operator to search for 'requestPort' in undefined
-[FAIL] SerialPort interface: existence and properties of interface object
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface object length
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface object name
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: existence and properties of interface prototype object
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: existence and properties of interface prototype object's "constructor" property
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: existence and properties of interface prototype object's @@unscopables property
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute onconnect
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute ondisconnect
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
+Found 1 FAIL, 0 TIMEOUT, 0 NOTRUN.
 [FAIL] SerialPort interface: attribute connected
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute readable
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: attribute writable
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation getInfo()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation open(SerialOptions)
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation setSignals(optional SerialOutputSignals)
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation getSignals()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation close()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] SerialPort interface: operation forget()
-  assert_own_property: self does not have own property "SerialPort" expected property "SerialPort" missing
-[FAIL] WorkerNavigator interface: attribute serial
-  assert_true: The prototype object must have a property "serial" expected true got false
-[FAIL] WorkerNavigator interface: navigator must inherit property "serial" with the proper type
-  assert_inherits: property "serial" not found in prototype chain
+  assert_true: The prototype object must have a property "connected" expected true got false
 Harness: the test ran to completion.