diff --git a/builder/frameworks/base.py b/builder/frameworks/base.py
index b43dc0b..4cef734 100644
--- a/builder/frameworks/base.py
+++ b/builder/frameworks/base.py
@@ -3,7 +3,7 @@
 from os.path import join
 
 import click
-from ltchiptool import Family
+from ltchiptool import Family, get_version
 from platformio.platform.base import PlatformBase
 from platformio.platform.board import PlatformBoardConfig
 from SCons.Errors import UserError
@@ -14,6 +14,12 @@ board: PlatformBoardConfig = env.BoardConfig()
 platform: PlatformBase = env.PioPlatform()
 family: Family = env["FAMILY_OBJ"]
 
+# Print information about installed core versions
+lt_version: str = env.ReadLTVersion(platform.get_dir(), platform.version)
+print("PLATFORM VERSIONS:")
+print(" - libretuya @", lt_version)
+print(" - ltchiptool @", get_version())
+
 # TODO remove include path prepending ("!<...>")
 # Move common core sources (env.AddCoreSources()) and Arduino libs
 # below per-family sources (to maintain child families taking precedence)
@@ -86,6 +92,12 @@ queue.AddExternalLibrary("ltchiptool")  # uf2ota source code
 queue.AddExternalLibrary("flashdb")
 queue.AddExternalLibrary("printf")
 
+# Find optimization level and add __OPTIMIZE_LEVEL__ macro
+for flag in env["CCFLAGS"]:
+    if not flag.startswith("-O"):
+        continue
+    env.Append(CPPDEFINES=[("__OPTIMIZE_LEVEL__", flag[2])])
+
 # Non-SDK defines & linker options
 queue.AppendPublic(
     CCFLAGS=[
@@ -102,13 +114,13 @@ queue.AppendPublic(
     ],
     CPPDEFINES=[
         ("LIBRETUYA", 1),
-        ("LT_VERSION", env.ReadLTVersion(platform.get_dir(), platform.version)),
+        ("LT_VERSION", lt_version),
         ("LT_BOARD", "${VARIANT}"),
         ("LT_VARIANT_H", r"\"${VARIANT}.h\""),
         ("F_CPU", board.get("build.f_cpu")),
         ("MCU", "${MCU}"),
         ("MCULC", "${MCULC}"),
-        ("FAMILY", "F_${FAMILY}"),
+        ("FAMILY", "F_${FAMILY_SHORT_NAME}"),
         # Add flash layout defines created in env.AddFlashLayout()
         *env["FLASH_DEFINES"].items(),
     ],
diff --git a/builder/utils/ltchiptool.py b/builder/utils/ltchiptool.py
index 3af3238..dc8ac5e 100644
--- a/builder/utils/ltchiptool.py
+++ b/builder/utils/ltchiptool.py
@@ -26,26 +26,24 @@ def env_uf2ota(env: Environment, *args, **kwargs):
         project_name,
         project_version,
         "${VARIANT}",
-        "${FAMILY}",
+        "${MCULC}",
         f"lt{lt_version}",
     ]
     output = "_".join(output) + ".uf2"
     if platform.custom("fw_output"):
         output = platform.custom("fw_output")
 
-    output = join("${BUILD_DIR}", output)
-    output_copy_1 = join("${BUILD_DIR}", "firmware.uf2")
-    output_copy_2 = join("${BUILD_DIR}", "firmware.bin")
-
-    env["UF2OUT"] = output
-    env["UF2OUT_BASE"] = basename(output)
+    outputs = [
+        join("${BUILD_DIR}", output),
+        join("${BUILD_DIR}", "firmware.uf2"),
+        join("${BUILD_DIR}", "firmware.bin"),
+    ]
+    output_opts = [f'--output "{output}"' for output in outputs]
 
     cmd = [
         "@${LTCHIPTOOL} uf2 write",
-        f'--output "{output}"',
-        f'--output-copy "{output_copy_1}"',
-        f'--output-copy "{output_copy_2}"',
-        "--family ${FAMILY}",
+        *output_opts,
+        "--family ${FAMILY_SHORT_NAME}",
         "--board ${VARIANT}",
         f"--lt-version {lt_version}",
         f'--fw "{project_name}:{project_version}"',
@@ -53,10 +51,9 @@ def env_uf2ota(env: Environment, *args, **kwargs):
         *env["UF2OTA"],
     ]
 
-    print(f"|-- {basename(env.subst(output))}")
+    for output in outputs:
+        print(f"|-- {basename(env.subst(output))}")
     env.Execute(" ".join(cmd))
-    print(f"|-- {basename(env.subst(output_copy_1))}")
-    print(f"|-- {basename(env.subst(output_copy_2))}")
 
 
 def env_flash_write(env: Environment):
diff --git a/cores/common/base/libretuya.h b/cores/common/base/libretuya.h
index f6a557e..0cf8b50 100644
--- a/cores/common/base/libretuya.h
+++ b/cores/common/base/libretuya.h
@@ -27,16 +27,12 @@
 #define LT_BOARD_STR	   STRINGIFY_MACRO(LT_BOARD)
 #define GCC_VERSION_STR                                                                                                \
 	STRINGIFY_MACRO(__GNUC__) "." STRINGIFY_MACRO(__GNUC_MINOR__) "." STRINGIFY_MACRO(__GNUC_PATCHLEVEL__)
+#define LT_BANNER_STR                                                                                                  \
+	"LibreTuya v" LT_VERSION_STR " on " LT_BOARD_STR ", compiled at " __DATE__ " " __TIME__ ", GCC " GCC_VERSION_STR   \
+	" (-O" STRINGIFY_MACRO(__OPTIMIZE_LEVEL__) ")"
 
 // Functional macros
-#define LT_BANNER()                                                                                                    \
-	LT_LOG(                                                                                                            \
-		LT_LEVEL_INFO,                                                                                                 \
-		__FUNCTION__,                                                                                                  \
-		__LINE__,                                                                                                      \
-		"LibreTuya v" LT_VERSION_STR " on " LT_BOARD_STR ", compiled at " __DATE__ " " __TIME__                        \
-		", GCC " GCC_VERSION_STR                                                                                       \
-	)
+#define LT_BANNER() LT_LOG(LT_LEVEL_INFO, __FUNCTION__, __LINE__, LT_BANNER_STR)
 
 // Types & macros
 #include "lt_config.h" // platform configuration options