diff --git a/client/cmdlfawid.c b/client/cmdlfawid.c
index 946656276..c2d4bc63b 100644
--- a/client/cmdlfawid.c
+++ b/client/cmdlfawid.c
@@ -383,7 +383,13 @@ static int CmdAWIDClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
+    // fast push mode
+    conn.block_after_ACK = true;
     for (uint8_t i = 0; i < 4; i++) {
+        if (i == 3) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlffdx.c b/client/cmdlffdx.c
index d652673e8..49d91344b 100644
--- a/client/cmdlffdx.c
+++ b/client/cmdlffdx.c
@@ -283,7 +283,13 @@ static int CmdFdxClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
+    // fast push mode
+    conn.block_after_ACK = true;
     for (int i = 4; i >= 0; --i) {
+        if (i == 0) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlfguard.c b/client/cmdlfguard.c
index a01b6dbaa..2476711ef 100644
--- a/client/cmdlfguard.c
+++ b/client/cmdlfguard.c
@@ -142,7 +142,6 @@ static int CmdGuardClone(const char *Cmd) {
     if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_guard_clone();
 
     uint32_t facilitycode = 0, cardnumber = 0, fc = 0, cn = 0, fmtlen = 0;
-    uint8_t i;
     uint8_t bs[96];
     memset(bs, 0x00, sizeof(bs));
 
@@ -173,7 +172,13 @@ static int CmdGuardClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
-    for (i = 0; i < 4; ++i) {
+    // fast push mode
+    conn.block_after_ACK = true;
+    for (uint8_t i = 0; i < 4; i++) {
+        if (i == 3) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlfjablotron.c b/client/cmdlfjablotron.c
index 4fea2b1b9..c2d4b6a78 100644
--- a/client/cmdlfjablotron.c
+++ b/client/cmdlfjablotron.c
@@ -157,7 +157,13 @@ static int CmdJablotronClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
+    // fast push mode
+    conn.block_after_ACK = true;
     for (uint8_t i = 0; i < 3; i++) {
+        if (i == 2) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlfkeri.c b/client/cmdlfkeri.c
index f722837ba..b99560567 100644
--- a/client/cmdlfkeri.c
+++ b/client/cmdlfkeri.c
@@ -148,7 +148,13 @@ static int CmdKeriClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
+    // fast push mode
+    conn.block_after_ACK = true;
     for (uint8_t i = 0; i < 3; i++) {
+        if (i == 2) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlfnedap.c b/client/cmdlfnedap.c
index ff5800322..417d4f6cf 100644
--- a/client/cmdlfnedap.c
+++ b/client/cmdlfnedap.c
@@ -204,7 +204,13 @@ static int CmdLFNedapClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
-    for (uint8_t i = 0; i<5; ++i ) {
+    // fast push mode
+    conn.block_after_ACK = true;
+    for (uint8_t i = 0; i < 5; i++) {
+        if (i == 4) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
diff --git a/client/cmdlfnoralsy.c b/client/cmdlfnoralsy.c
index 9455ce916..667a80d16 100644
--- a/client/cmdlfnoralsy.c
+++ b/client/cmdlfnoralsy.c
@@ -156,7 +156,13 @@ static int CmdNoralsyClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
+    // fast push mode
+    conn.block_after_ACK = true;
     for (uint8_t i = 0; i < 4; i++) {
+        if (i == 3) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlfpresco.c b/client/cmdlfpresco.c
index 8222bb0be..b710fd112 100644
--- a/client/cmdlfpresco.c
+++ b/client/cmdlfpresco.c
@@ -122,7 +122,13 @@ static int CmdPrescoClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
+    // fast push mode
+    conn.block_after_ACK = true;
     for (uint8_t i = 0; i < 5; i++) {
+        if (i == 4) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlfpyramid.c b/client/cmdlfpyramid.c
index 0823abb77..f5d848672 100644
--- a/client/cmdlfpyramid.c
+++ b/client/cmdlfpyramid.c
@@ -234,7 +234,13 @@ static int CmdPyramidClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
-    for (uint8_t i = 0; i < 5; ++i) {
+    // fast push mode
+    conn.block_after_ACK = true;
+    for (uint8_t i = 0; i < 5; i++) {
+        if (i == 4) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
diff --git a/client/cmdlfvisa2000.c b/client/cmdlfvisa2000.c
index 2980b0a5c..2d5808f29 100644
--- a/client/cmdlfvisa2000.c
+++ b/client/cmdlfvisa2000.c
@@ -168,7 +168,13 @@ static int CmdVisa2kClone(const char *Cmd) {
 
     PacketResponseNG resp;
 
+    // fast push mode
+    conn.block_after_ACK = true;
     for (uint8_t i = 0; i < 4; i++) {
+        if (i == 3) {
+            // Disable fast mode on last packet
+            conn.block_after_ACK = false;
+        }
         clearCommandBuffer();
         SendCommandMIX(CMD_T55XX_WRITE_BLOCK, blocks[i], i, 0, NULL, 0);
         if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {