diff --git a/core/embed/firmware/main.c b/core/embed/firmware/main.c
index db1d244eb..2b7136b27 100644
--- a/core/embed/firmware/main.c
+++ b/core/embed/firmware/main.c
@@ -104,6 +104,26 @@
 // from util.s
 extern void shutdown_privileged(void);
 
+#ifdef USE_OPTIGA
+#if !PYOPT
+#include <inttypes.h>
+#if 1  // color log
+#define OPTIGA_LOG_FORMAT \
+  "%" PRIu32 " \x1b[35moptiga\x1b[0m \x1b[32mDEBUG\x1b[0m %s: "
+#else
+#define OPTIGA_LOG_FORMAT "%" PRIu32 " optiga DEBUG %s: "
+#endif
+static void optiga_log_hex(const char *prefix, const uint8_t *data,
+                           size_t data_size) {
+  printf(OPTIGA_LOG_FORMAT, hal_ticks_ms() * 1000, prefix);
+  for (size_t i = 0; i < data_size; i++) {
+    printf("%02x", data[i]);
+  }
+  printf("\n");
+}
+#endif
+#endif
+
 int main(void) {
   random_delays_init();
 
@@ -199,6 +219,14 @@ int main(void) {
 #endif
 
 #ifdef USE_OPTIGA
+
+#if !PYOPT
+  // command log is relatively quiet so we enable it in debug builds
+  optiga_command_set_log_hex(optiga_log_hex);
+  // transport log can be spammy, uncomment if you want it:
+  // optiga_transport_set_log_hex(optiga_log_hex);
+#endif
+
   optiga_init();
   optiga_open_application();
   if (sectrue == secret_ok) {
diff --git a/core/embed/trezorhal/optiga/optiga_commands.c b/core/embed/trezorhal/optiga/optiga_commands.c
index 3884dd6a7..a77d79591 100644
--- a/core/embed/trezorhal/optiga/optiga_commands.c
+++ b/core/embed/trezorhal/optiga/optiga_commands.c
@@ -75,7 +75,7 @@ static optiga_result process_output(uint8_t **out_data, size_t *out_size) {
 
   *out_data = tx_buffer + 4;
   *out_size = tx_size - 4;
-  OPTIGA_LOG("SUCCESS ", *out_data, *out_size)
+  OPTIGA_LOG("SUCCESS", *out_data, *out_size)
   return OPTIGA_SUCCESS;
 }
 
diff --git a/core/embed/trezorhal/optiga/optiga_transport.c b/core/embed/trezorhal/optiga/optiga_transport.c
index 362d6821d..16f0ca017 100644
--- a/core/embed/trezorhal/optiga/optiga_transport.c
+++ b/core/embed/trezorhal/optiga/optiga_transport.c
@@ -184,7 +184,7 @@ optiga_result optiga_init(void) {
 }
 
 static optiga_result optiga_i2c_write(const uint8_t *data, uint16_t data_size) {
-  OPTIGA_LOG(">>> ", data, data_size)
+  OPTIGA_LOG(">>>", data, data_size)
 
   for (int try_count = 0; try_count <= I2C_MAX_RETRY_COUNT; ++try_count) {
     if (try_count != 0) {
@@ -205,7 +205,7 @@ static optiga_result optiga_i2c_read(uint8_t *buffer, uint16_t buffer_size) {
     HAL_Delay(1);
     if (HAL_OK == i2c_receive(OPTIGA_I2C_INSTANCE, OPTIGA_ADDRESS, buffer,
                               buffer_size, I2C_TIMEOUT)) {
-      OPTIGA_LOG("<<< ", buffer, buffer_size)
+      OPTIGA_LOG("<<<", buffer, buffer_size)
       return OPTIGA_SUCCESS;
     }
   }