diff --git a/images/umtrx_txrx_uhd.bin b/images/umtrx_txrx_uhd.bin
index 2aa4bef0..5e53c254 100755
Binary files a/images/umtrx_txrx_uhd.bin and b/images/umtrx_txrx_uhd.bin differ
diff --git a/zpu/lib/spi.c b/zpu/lib/spi.c
index 6f2f7489..d7e0b4c3 100644
--- a/zpu/lib/spi.c
+++ b/zpu/lib/spi.c
@@ -51,5 +51,5 @@ uint32_t spi_transact(bool readback, int slave, uint32_t data, int length, uint3
     if (!readback) return 0;
 
     spi_wait();
-    return readback_mux->spi;
+    return readback_mux->spi & ((1 << length)-1);
 }
diff --git a/zpu/lib/umtrx_init.c b/zpu/lib/umtrx_init.c
index 444ff48c..016e3c6b 100644
--- a/zpu/lib/umtrx_init.c
+++ b/zpu/lib/umtrx_init.c
@@ -45,9 +45,9 @@ umtrx_init(void)
 
   // Check LMS presense
   res = spi_transact(SPI_TXRX, SPI_SS_LMS1, LMS_RD_CMD(0x04), 16, SPI_PUSH_FALL|SPI_LATCH_RISE);
-  printf("LMS1 chip version = 0x%x\n", res & 0xffff);
+  printf("LMS1 chip version = 0x%x\n", res);
   res = spi_transact(SPI_TXRX, SPI_SS_LMS2, LMS_RD_CMD(0x04), 16, SPI_PUSH_FALL|SPI_LATCH_RISE);
-  printf("LMS2 chip version = 0x%x\n", res & 0xffff);
+  printf("LMS2 chip version = 0x%x\n", res);
 
   // Init GPSDO
   gpsdo_init();