diff --git a/build.sh b/build.sh
index 2b5539a2..894103bd 100755
--- a/build.sh
+++ b/build.sh
@@ -2736,11 +2736,7 @@ requires_full_usb_packet_logging() {
   # Full Companion and the combined USB+WiFi infrastructure artifact always
   # carry the logger behind runtime controls. Other Full profiles retain the
   # ordinary explicit logging-off/disable-debug behavior.
-  # T1000-E Full has a single, stability-critical USB CDC endpoint. It keeps
-  # that endpoint for Companion data and the terminal, not optional packet
-  # logging, so its packaged contract must not promise a logger.
-  [ "$env_name" != "t1000e_companion_radio_full" ] \
-    && is_companion_radio_full_target "$env_name" && return 0
+  is_companion_radio_full_target "$env_name" && return 0
   [ "$ESP32_FULL_BUILD" = "1" ] || return 1
   is_companion_build "$env_name" && return 1
   [ "${PACKET_LOGGING_OVERRIDE,,}" = "on" ] && return 0
@@ -3291,9 +3287,7 @@ declare_build_capability_contract() {
     record_build_expectation "companion.usb" "+++MESHCORE-TERM-START"
     record_build_expectation "companion.bluetooth" \
       "Companion: starting Bluetooth"
-    if [ "$env_name" != "t1000e_companion_radio_full" ]; then
-      record_build_expectation "companion.usb_logging" "get usb.logging"
-    fi
+    record_build_expectation "companion.usb_logging" "get usb.logging"
     record_build_expectation "companion.usb_mota_source" "ota folder on"
     record_build_expectation "companion.mota_sender" \
       "_ZN4mesh3ota16SerialMotaSource4read"
@@ -3852,9 +3846,9 @@ apply_companion_radio_full_profile() {
     # an exclusive host-folder mode with its existing `ota folder on` preamble.
     # CDC 1 is a write-only plaintext packet/debug logging stream; BLE remains
     # an independent Companion link. ESP32 intentionally does not use this
-    # dual-CDC capability. The T1000-E's nRF52840 USB hardware resets when
-    # its persisted logging preference asks TinyUSB to activate CDC 1, so it
-    # intentionally keeps logging on the primary USB interface instead.
+    # dual-CDC capability. The T1000-E has one stable CDC endpoint only: its
+    # logging preference claims that primary port as an ASCII terminal plus
+    # logs, and therefore never creates CDC 1 or mixes logs with framed USB.
     append_platformio_build_unflags "-UOTA_FOLDER_SERIAL"
     # The nRF52 core's production-safe Bluefruit bootstrap must retain its
     # early SoftDevice diagnostics.  Without CFG_DEBUG, a few nRF52840 USB
@@ -3864,15 +3858,11 @@ apply_companion_radio_full_profile() {
     export PLATFORMIO_BUILD_FLAGS="${PLATFORMIO_BUILD_FLAGS} -DOTA_FOLDER_SERIAL=1 -DCOMPANION_FEATURE_USB_MOTA_SOURCE=1 -DCOMPANION_FEATURE_BLE_MOTA_SOURCE=1 -DMESH_DEBUG=1 -DMESH_PACKET_LOGGING=1 -DCFG_DEBUG=1 -DRECOVERABLE_EXTERNAL_RADIO=1"
     if [ "$env_name" = "t1000e_companion_radio_full" ]; then
       # The T1000-E's primary CDC transport is the only USB interface. Its
-      # optional packet/debug logger can make the device reset while a host is
-      # enumerating, so keep Full Companion USB strictly data/terminal-only.
-      # This also ignores a stale persisted `usb.logging on` preference from
-      # an older dual-CDC image, allowing the device to recover automatically.
-      export PLATFORMIO_BUILD_FLAGS="${PLATFORMIO_BUILD_FLAGS} -DMESH_USB_LOGGING_DISABLED=1"
-      # MESH_USB_LOGGING_DISABLED still silences MeshCore's optional packet
-      # logger on the shared CDC endpoint. The shared nRF52 Full profile above
-      # retains the validated BLE bootstrap and radio recovery behavior.
-      append_platformio_build_unflags "-UMESH_DEBUG -UMESH_PACKET_LOGGING"
+      # `usb.logging on` selects an input-capable ASCII logging terminal on
+      # CDC 0. `usb.logging off` restores automatic framed-Companion detection.
+      # Do not instantiate or re-enumerate a second CDC interface on this
+      # board: its native USB/SoftDevice handoff is sensitive to that change.
+      :
     else
       export PLATFORMIO_BUILD_FLAGS="${PLATFORMIO_BUILD_FLAGS} -DCOMPANION_FEATURE_DEDICATED_USB_LOGGING=1 -DCFG_TUD_CDC=2 -DMESH_DUAL_CDC_LOGGING=1"
     fi
diff --git a/examples/companion_radio/main.cpp b/examples/companion_radio/main.cpp
index b9ddb161..d7ecbc2a 100644
--- a/examples/companion_radio/main.cpp
+++ b/examples/companion_radio/main.cpp
@@ -976,6 +976,19 @@ static void beginUsbDefaultSession() {
 static void serviceUsbTerminal() {
 #if COMPANION_FEATURE_USB_MOTA_SOURCE
   if (usb_mota_mode) {
+#if MESH_USB_LOGGING_AVAILABLE
+    // A single-TTY logger and framed USB mOTA cannot share the primary USB
+    // stream. A remote logging change can arrive while mOTA owns USB, so stop
+    // the transfer before its next binary exchange and return to ASCII.
+    if (!mesh::hasDedicatedUsbLoggingPort()
+        && mesh::isUsbLoggingEnabled()) {
+      leaveUsbMotaMode(false);
+      enterUsbLoggingTerminalMode();
+      usbTerminalOutput().print(
+          "\r\nUSB mOTA stopped: USB logging owns this port\r\n> ");
+      return;
+    }
+#endif
     serviceUsbMota();
     return;
   }
@@ -1093,6 +1106,15 @@ static void serviceUsbTerminal() {
       // instead of letting the ordinary terminal command handler leave the
       // stream in line-oriented mode.
       if (strcmp(usb_terminal_line, USB_MOTA_START_TOKEN) == 0) {
+#if MESH_USB_LOGGING_AVAILABLE
+        if (!mesh::hasDedicatedUsbLoggingPort()
+            && mesh::isUsbLoggingEnabled()) {
+          clearUsbTerminalLine();
+          usbTerminalOutput().print(
+              "\r\nERROR: set usb.logging off before USB mOTA\r\n> ");
+          return;
+        }
+#endif
         leaveUsbTerminalMode(false);
         enterUsbMotaMode(mesh::UsbMotaEntryOrigin::ASCII);
         return;
diff --git a/test/test_build_profiles.sh b/test/test_build_profiles.sh
index bdbc3692..38a82e00 100644
--- a/test/test_build_profiles.sh
+++ b/test/test_build_profiles.sh
@@ -598,8 +598,12 @@ for full_env in "${SUPPORTED_PIO_ENVS[@]}"; do
       || fail "$full_env must keep a single USB CDC interface"
     [[ "$PLATFORMIO_BUILD_FLAGS" != *"MESH_DUAL_CDC_LOGGING=1"* ]] \
       || fail "$full_env must keep USB logging on its primary interface"
-    [[ "$PLATFORMIO_BUILD_FLAGS" == *"MESH_USB_LOGGING_DISABLED=1"* ]] \
-      || fail "$full_env must disable its unstable primary USB logger"
+    [[ "$PLATFORMIO_BUILD_FLAGS" != *"MESH_USB_LOGGING_DISABLED=1"* ]] \
+      || fail "$full_env must retain its single-port USB logging terminal"
+    [[ "$PLATFORMIO_BUILD_FLAGS" == *"MESH_DEBUG=1"* ]] \
+      || fail "$full_env must retain USB diagnostics on its logging terminal"
+    [[ "$PLATFORMIO_BUILD_FLAGS" == *"MESH_PACKET_LOGGING=1"* ]] \
+      || fail "$full_env must retain packet logging on its logging terminal"
     [[ "$PLATFORMIO_BUILD_FLAGS" != *"COMPANION_BLE_PRPH_MTU="* ]] \
       || fail "$full_env must retain the normal Full-Companion BLE bandwidth"
     [[ "$PLATFORMIO_BUILD_FLAGS" != *"COMPANION_BLUETOOTH_BOOT_DELAY_MS="* ]] \
@@ -794,7 +798,7 @@ done
 for logging_target in Station_G2_companion_radio_full RAK_4631_companion_radio_full; do
   verify_full_logging_contract "$logging_target" 0 off 1 yes no
 done
-verify_full_logging_contract t1000e_companion_radio_full 0 off 1 no no
+verify_full_logging_contract t1000e_companion_radio_full 0 off 1 yes no
 
 # Synthetic inventory: ESP32 and nRF52 repeater/room-server targets with the
 # same lean OTA policy. The sensor deliberately has no lean sibling.
diff --git a/tools/mota/test_mota.py b/tools/mota/test_mota.py
index 544dc802..7abd41d4 100644
--- a/tools/mota/test_mota.py
+++ b/tools/mota/test_mota.py
@@ -339,12 +339,12 @@ def test_canonical_bulk_matrix_omits_runtime_and_transport_aliases():
     assert "-DCFG_TUD_CDC=2" in nrf52_full
     assert "-DMESH_DUAL_CDC_LOGGING=1" in nrf52_full
     # Every nRF52 Full image keeps the proven Bluefruit bootstrap and radio
-    # recovery profile. T1000-E alone disables its optional packet logger
-    # because its sole CDC endpoint is reserved for Companion data/terminal.
+    # recovery profile. T1000-E keeps its sole CDC endpoint for a mutually
+    # exclusive ASCII logging terminal rather than instantiating CDC 1.
     assert "-DCFG_DEBUG=1" in nrf52_full
     assert "-DRECOVERABLE_EXTERNAL_RADIO=1" in nrf52_full
     assert 'if [ "$env_name" = "t1000e_companion_radio_full" ]; then' in nrf52_full
-    assert "-DMESH_USB_LOGGING_DISABLED=1" in nrf52_full
+    assert "MESH_USB_LOGGING_DISABLED" not in nrf52_full
     esp32_full = full.split("return 0\n  fi", 1)[1]
     assert "-DCFG_TUD_CDC=2" not in esp32_full
     assert "-DMESH_DUAL_CDC_LOGGING=1" not in esp32_full
@@ -481,6 +481,12 @@ def test_single_tty_logging_off_restores_each_builds_default_mode():
         "if (strcmp(usb_terminal_line, USB_TERMINAL_STOP_TOKEN) == 0) {", 1
     )[1].split("}", 1)[0]
     assert "leaveUsbTerminalMode(true);" in terminal_stop
+    usb_mota_start = service.split(
+        "if (strcmp(usb_terminal_line, USB_MOTA_START_TOKEN) == 0) {", 1
+    )[1].split("leaveUsbTerminalMode(false);", 1)[0]
+    assert "set usb.logging off before USB mOTA" in usb_mota_start
+    assert "!mesh::hasDedicatedUsbLoggingPort()" in usb_mota_start
+    assert "mesh::isUsbLoggingEnabled()" in usb_mota_start
     assert "if (!usb_logging_terminal_mode" in service
     assert "usb_binary_startup_probe.shouldStart(" in service