diff --git a/lib/ble/tests/test_ble_transport.c b/lib/ble/tests/test_ble_transport.c
index fd903047..b1630b02 100644
--- a/lib/ble/tests/test_ble_transport.c
+++ b/lib/ble/tests/test_ble_transport.c
@@ -9,7 +9,7 @@
 #define CHECK(v) do { if (!(v)) { fprintf(stderr, "FAIL line=%d: %s\n", __LINE__, #v); exit(1); } } while (0)
 struct fake_link {
     ble_link_id id, other; struct ble_backend* peer; uint8_t data[512]; size_t len; int pending;
-    enum ble_wire_channel channel; uint64_t ack_at; uint16_t ack_id;
+    enum ble_wire_channel channel; uint64_t ack_at; uint16_t ack_id, ack_delivered;
 };
 struct ble_backend { struct ble_transport* owner; struct UASYNC* ua; void* task; int index, started; struct fake_link links[16]; };
 static struct ble_backend* backends[3];
@@ -69,7 +69,10 @@ static void run(void* arg) {
         struct ble_backend* peer = f->peer;
         uint8_t data[512]; size_t len = f->len; memcpy(data, f->data, len); f->pending = 0;
         int dropped = f->channel != BLE_WIRE_ACK && data[f->channel == BLE_WIRE_DATA ? 2 : 0] == 3 && drop && --drop == 0;
-        if (!dropped && peer && slot(peer, other)) ble_backend_received(peer->owner, other, f->channel, data, len);
+        if (!dropped && peer && slot(peer, other)) {
+            if (f->channel == BLE_WIRE_ACK) f->ack_delivered = f->ack_id;
+            ble_backend_received(peer->owner, other, f->channel, data, len);
+        }
         if (slot(b, id)) ble_backend_sent(b->owner, id, 1);
     }
 }
@@ -172,8 +175,8 @@ static void exercise_flow(void) {
     CHECK(!ble_tx_ready(a, id) && !ble_tx_ready(b, other));
     uint64_t paused = data_wire_bytes[0];
     struct fake_link* receiver = slot(backends[1], other); CHECK(receiver);
-    uint8_t duplicate[2] = {receiver->ack_id >> 8, receiver->ack_id};
-    /* Только уже доставленный ACK: до запуска отложенного ACK последняя запись ещё от HELLO. */
+    uint8_t duplicate[2] = {receiver->ack_delivered >> 8, receiver->ack_delivered};
+    /* Повтор уже доставленного ACK не подтверждает новые данные даже при зависшем ACK в backend. */
     ble_backend_received(a, id, BLE_WIRE_ACK, duplicate, 2);
     for (unsigned i = 0; i < 1000; i++) uasync_poll(ua, 0);
     CHECK(data_wire_bytes[0] == paused && !ble_tx_ready(a, id));
diff --git a/tools/cgathui_common/tests/test_ble_etcp.c b/tools/cgathui_common/tests/test_ble_etcp.c
index ede1936b..21d6b8ad 100644
--- a/tools/cgathui_common/tests/test_ble_etcp.c
+++ b/tools/cgathui_common/tests/test_ble_etcp.c
@@ -80,7 +80,7 @@ static void run(void* arg) {
         uint8_t data[512]; size_t len = f->len; memcpy(data, f->data, len); f->pending = 0;
         unsigned prefix = f->channel == BLE_WIRE_DATA ? 2 : 0;
         uint8_t* body = data + prefix;
-        if (corrupt_keys && f->channel == BLE_WIRE_DATA && len >= 22 &&
+        if (corrupt_keys && f->channel == BLE_WIRE_DATA && len >= 18 &&
             body[0] == 3 && body[3] == 0 && body[4] == 40 && body[5] == 0 && body[6] == 0) {
             data[len - 1] ^= 1; corrupt_keys--;
         }