diff --git a/TNC/KissHardware.cpp b/TNC/KissHardware.cpp
index d5165b3..3776ff1 100644
--- a/TNC/KissHardware.cpp
+++ b/TNC/KissHardware.cpp
@@ -43,10 +43,10 @@ int powerOffViaUSB(void)
 namespace mobilinkd { namespace tnc { namespace kiss {
 
 #ifdef NUCLEOTNC
-const char FIRMWARE_VERSION[] = "2.2.2";
+const char FIRMWARE_VERSION[] = "2.3.0";
 const char HARDWARE_VERSION[] = "Mobilinkd NucleoTNC";
 #else
-const char FIRMWARE_VERSION[] = "2.2.2";
+const char FIRMWARE_VERSION[] = "2.3.0";
 const char HARDWARE_VERSION[] = "Mobilinkd TNC3 2.1.1";
 #endif
 
diff --git a/TNC/M17Encoder.cpp b/TNC/M17Encoder.cpp
index 220fc68..a8b45f8 100644
--- a/TNC/M17Encoder.cpp
+++ b/TNC/M17Encoder.cpp
@@ -220,7 +220,7 @@ void M17Encoder::process_stream(tnc::hdlc::IoFrame* frame, FrameType type)
         }
         break;
     case State::ACTIVE:
-        if (frame->size() == 26)
+        if (frame->size() == 24)
         {
             send_stream(frame, type);   // Consumes frame.
         }
@@ -356,7 +356,7 @@ void M17Encoder::send_stream(tnc::hdlc::IoFrame* frame, FrameType)
     auto fit = std::copy(lich.begin(), lich.end(), m17_frame.begin());
 
     // Encode &  puncture
-    std::array<uint8_t, 20> data;
+    std::array<uint8_t, 18> data;
     std::copy(it, frame->end(), data.begin());
 
     if (data[0] & 0x80) state = State::IDLE; // EOS
diff --git a/TNC/M17FrameDecoder.h b/TNC/M17FrameDecoder.h
index fd41d21..c7fc578 100644
--- a/TNC/M17FrameDecoder.h
+++ b/TNC/M17FrameDecoder.h
@@ -165,7 +165,7 @@ struct M17FrameDecoder
     using lsf_buffer_t = std::array<uint8_t, 30>;
 
     using audio_conv_buffer_t = std::array<uint8_t, 34>;
-    using audio_buffer_t = std::array<uint8_t, 20>;
+    using audio_buffer_t = std::array<uint8_t, 18>;
 
     using link_setup_callback_t = std::function<void(audio_buffer_t)>;
     using audio_callback_t = std::function<void(audio_buffer_t)>;
@@ -177,7 +177,7 @@ struct M17FrameDecoder
         std::array<uint8_t, 30> lich;
         std::array<uint8_t, 240> lsf;
         std::array<uint8_t, 206> packet;
-        std::array<uint8_t, 160> stream;
+        std::array<uint8_t, 144> stream;
     } output;
 
     union {
@@ -388,7 +388,7 @@ struct M17FrameDecoder
     [[gnu::noinline]]
     DecodeResult decode_stream(buffer_t& buffer, tnc::hdlc::IoFrame*& stream, int& ber)
     {
-        std::array<uint8_t, 20> stream_segment;
+        std::array<uint8_t, 18> stream_segment;
         DecodeResult result = DecodeResult::OK;
 
         unpack_lich(buffer);
@@ -397,17 +397,12 @@ struct M17FrameDecoder
         for (auto c : tmp.lich) stream->push_back(c);
 
         std::copy(buffer.begin() + 96, buffer.end(), tmp.stream.begin());
-        auto dp = depunctured<328>(P2, tmp.stream);
+        auto dp = depunctured<296>(P2, tmp.stream);
         ber = viterbi_.decode(dp, output.stream);
-        ber = ber > 28 ? ber - 28 : 0;
         detail::to_frame(stream, output.stream);
         detail::to_bytes(output.packet, stream_segment);
 
-        crc_.reset();
-        for (auto c : stream_segment) crc_(c);
-        auto checksum = crc_.get();
-        INFO("crc = %04x", checksum);   // Otherwise ignored.
-        if ((checksum == 0) && (stream_segment[0] & 0x80))
+        if ((ber < 70) && (stream_segment[0] & 0x80))
         {
             INFO("EOS");
             state_ = State::LSF;
diff --git a/TNC/Trellis.h b/TNC/Trellis.h
index 37102f5..4554805 100644
--- a/TNC/Trellis.h
+++ b/TNC/Trellis.h
@@ -24,10 +24,8 @@ inline constexpr auto P1 = std::experimental::make_array<int8_t>(
 
 /// Puncture matrix for audio frames.
 inline constexpr auto P2 = std::experimental::make_array<int8_t>(
-    1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1,
-    0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1,
-    0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1);
+    1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 0);
 
 /// Puncture matrix for packet frames (7/8).
 inline constexpr auto P3 = std::experimental::make_array<int8_t>(
diff --git a/TNC/Util.h b/TNC/Util.h
index 614f360..50379cd 100644
--- a/TNC/Util.h
+++ b/TNC/Util.h
@@ -145,7 +145,6 @@ auto llr(FloatType sample)
 template <size_t M, typename T, size_t N, typename U, size_t IN>
 auto depunctured(std::array<T, N> puncture_matrix, std::array<U, IN> in)
 {
-    static_assert(M % N == 0);
     std::array<U, M> result;
     size_t index = 0;
     size_t pindex = 0;