diff --git a/DSView/pv/mainwindow.cpp b/DSView/pv/mainwindow.cpp
index 4a034870..2b5a50e0 100644
--- a/DSView/pv/mainwindow.cpp
+++ b/DSView/pv/mainwindow.cpp
@@ -239,8 +239,8 @@ namespace pv
         connect(&_event, SIGNAL(session_error()), this, SLOT(on_session_error()));
         connect(&_event, SIGNAL(signals_changed()), this, SLOT(on_signals_changed()));
         connect(&_event, SIGNAL(receive_trigger(quint64)), this, SLOT(on_receive_trigger(quint64)));
-        connect(&_event, SIGNAL(frame_ended()), this, SLOT(on_frame_ended()));
-        connect(&_event, SIGNAL(frame_began()), this, SLOT(on_frame_began()));
+        connect(&_event, SIGNAL(frame_ended()), this, SLOT(on_frame_ended()), Qt::DirectConnection);
+        connect(&_event, SIGNAL(frame_began()), this, SLOT(on_frame_began()), Qt::DirectConnection);
         connect(&_event, SIGNAL(decode_done()), this, SLOT(on_decode_done()));
         connect(&_event, SIGNAL(data_updated()), this, SLOT(on_data_updated()));
         connect(&_event, SIGNAL(cur_snap_samplerate_changed()), this, SLOT(on_cur_snap_samplerate_changed()));
@@ -362,27 +362,6 @@ namespace pv
             details = L_S(STR_PAGE_MSG, S_ID(IDS_MSG_MALLOC_ERROR_DET), 
                       "Memory is not enough for this sample!\nPlease reduce the sample depth!");
             break;
-        case SigSession::Test_data_err:
-            _session->stop_capture();
-            update_toolbar_view_status();
-
-            title = L_S(STR_PAGE_MSG, S_ID(IDS_DATA_ERROR), "Data Error");
-            error_pattern = _session->get_error_pattern();
-
-            for (int i = 0; i < 16; i++)
-            {
-                if (error_pattern & 0x01)
-                    ch_status += "X ";
-                else
-                    ch_status += "  ";
-                ch_status += (i > 9 ? " " : "");
-                error_pattern >>= 1;
-            }
-
-            details = QString(L_S(STR_PAGE_MSG, S_ID(IDS_DATA_ERROR_DET1),"the received data are not consist with pre-defined test data!")) + "\n" +
-                      QString("0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15") + "\n" +
-                      ch_status;
-            break;
         case SigSession::Pkt_data_err:
             title = L_S(STR_PAGE_MSG, S_ID(IDS_MSG_PACKET_ERROR), "Packet Error");
             details = L_S(STR_PAGE_MSG, S_ID(IDS_MSG_PACKET_ERROR_DET), 
diff --git a/DSView/pv/sigsession.cpp b/DSView/pv/sigsession.cpp
index 934f2fbe..7558e1d7 100644
--- a/DSView/pv/sigsession.cpp
+++ b/DSView/pv/sigsession.cpp
@@ -922,13 +922,6 @@ namespace pv
 
     void SigSession::feed_in_logic(const sr_datafeed_logic &o)
     {
-        if (o.data_error == 1)
-        {
-            _error = Test_data_err;
-            _error_pattern = o.error_pattern;
-            _callback->session_error();
-        }
-
         if (_view_data->get_logic()->memory_failed())
         {
             dsv_err("%s", "Unexpected logic packet");
diff --git a/DSView/pv/sigsession.h b/DSView/pv/sigsession.h
index 88945a7c..a4559e42 100644
--- a/DSView/pv/sigsession.h
+++ b/DSView/pv/sigsession.h
@@ -131,8 +131,7 @@ public:
    enum SESSION_ERROR_STATUS {
         No_err,
         Hw_err,
-        Malloc_err,
-        Test_data_err,
+        Malloc_err, 
         Test_timeout_err,
         Pkt_data_err,
         Data_overflow
diff --git a/libsigrok4DSL/hardware/DSL/dsl.c b/libsigrok4DSL/hardware/DSL/dsl.c
index 5fb85f88..7a393dc9 100644
--- a/libsigrok4DSL/hardware/DSL/dsl.c
+++ b/libsigrok4DSL/hardware/DSL/dsl.c
@@ -35,7 +35,6 @@ SR_PRIV int dsl_secuWrite(const struct sr_dev_inst *sdi, uint16_t cmd, uint16_t
 SR_PRIV gboolean dsl_isSecuReady(const struct sr_dev_inst *sdi);
 SR_PRIV gboolean dsl_isSecuPass(const struct sr_dev_inst *sdi);
 SR_PRIV uint16_t dsl_secuRead(const struct sr_dev_inst *sdi);
-SR_PRIV int dsl_secuCheck(const struct sr_dev_inst *sdi, uint16_t* encryption, int steps);
 
 static const int32_t probeOptions[] = {
     SR_CONF_PROBE_COUPLING,
diff --git a/libsigrok4DSL/hardware/DSL/dsl.h b/libsigrok4DSL/hardware/DSL/dsl.h
index 59f73a5f..2494ee72 100644
--- a/libsigrok4DSL/hardware/DSL/dsl.h
+++ b/libsigrok4DSL/hardware/DSL/dsl.h
@@ -1356,4 +1356,6 @@ SR_PRIV int dsl_header_size(const struct DSL_context *devc);
 
 SR_PRIV int dsl_destroy_device(const struct sr_dev_inst *sdi);
 
+SR_PRIV int dsl_secuCheck(const struct sr_dev_inst *sdi, uint16_t* encryption, int steps);
+
 #endif
diff --git a/libsigrok4DSL/hardware/DSL/dslogic.c b/libsigrok4DSL/hardware/DSL/dslogic.c
index 1e7f2a18..580e3f04 100644
--- a/libsigrok4DSL/hardware/DSL/dslogic.c
+++ b/libsigrok4DSL/hardware/DSL/dslogic.c
@@ -1090,7 +1090,11 @@ static int config_set(int id, GVariant *data, struct sr_dev_inst *sdi,
     } 
     else if (id == SR_CONF_VTH) {
         devc->vth = g_variant_get_double(data);
-        ret = dsl_wr_reg(sdi, VTH_ADDR, (uint8_t)(devc->vth/5.0*255));
+
+        if (devc->profile->dev_caps.feature_caps & CAPS_FEATURE_MAX25_VTH)
+            ret = dsl_wr_reg(sdi, VTH_ADDR, (uint8_t)(devc->vth/5.0*(2.5/3.3)*255));
+        else
+            ret = dsl_wr_reg(sdi, VTH_ADDR, (uint8_t)(devc->vth/5.0*255));
     } 
     else if (id == SR_CONF_MAX_HEIGHT) {
         stropt = g_variant_get_string(data, NULL);
@@ -1255,9 +1259,12 @@ static int dev_open(struct sr_dev_inst *sdi)
 
     devc = sdi->priv;
 
-    if ((ret = dsl_dev_open(di, sdi, &fpga_done)) == SR_OK) {
+    if ((ret = dsl_dev_open(di, sdi, &fpga_done)) == SR_OK) {        
+        if (devc->profile->dev_caps.feature_caps & CAPS_FEATURE_MAX25_VTH)
+            ret = dsl_wr_reg(sdi, VTH_ADDR, (uint8_t)(devc->vth/5.0*(2.5/3.3)*255));
+        else
+            ret = dsl_wr_reg(sdi, VTH_ADDR, (uint8_t)(devc->vth/5.0*255));
         // set threshold
-        ret = dsl_wr_reg(sdi, VTH_ADDR, (uint8_t)(devc->vth/5.0*255));
         if (devc->profile->dev_caps.feature_caps & CAPS_FEATURE_ADF4360) {
             dsl_config_adc(sdi, adc_clk_init_500m);
         }