diff --git a/builder/frameworks/realtek-ambz-sdk.py b/builder/frameworks/realtek-ambz-sdk.py
index a20e8ca..c163664 100644
--- a/builder/frameworks/realtek-ambz-sdk.py
+++ b/builder/frameworks/realtek-ambz-sdk.py
@@ -10,31 +10,6 @@ board = env.BoardConfig()
 
 env.AddDefaults("realtek-ambz", "framework-realtek-amb1")
 
-flash_addr = board.get("build.amb_flash_addr")
-flash_ota1_offset = env.subst("$FLASH_OTA1_OFFSET")
-flash_ota2_offset = env.subst("$FLASH_OTA2_OFFSET")
-boot_all = board.get("build.amb_boot_all")
-ota1_offset = hex(int(flash_addr, 16) + int(flash_ota1_offset, 16))
-ota2_offset = hex(int(flash_addr, 16) + int(flash_ota2_offset, 16))
-
-# Outputs
-env.Replace(
-    IMG_FW="image2_all_ota1.bin",
-    IMG_OTA="ota_all.bin",
-    LINK="python ${LT_DIR}/tools/link2bin.py AMBZ xip1 xip2",
-)
-
-# Tools
-# fmt: off
-TOOL_DIR = join("$SDK_DIR", "component", "soc", "realtek", "8711b", "misc", "iar_utility", "common", "tools")
-# fmt: on
-env.Replace(
-    PICK=join(TOOL_DIR, "pick"),
-    PAD=join(TOOL_DIR, "pad"),
-    CHECKSUM=join(TOOL_DIR, "checksum"),
-    OTA=join(TOOL_DIR, "ota"),
-)
-
 # Flags
 env.Append(
     CFLAGS=[
@@ -295,11 +270,6 @@ env.Append(
         )
     ),
 )
-actions = [
-    # env.VerboseAction(package_ota, "Packaging OTA image - $IMG_OTA"),
-    env.VerboseAction("true", f"- OTA1 flash offset: $FLASH_OTA1_OFFSET"),
-    env.VerboseAction("true", f"- OTA2 flash offset: $FLASH_OTA2_OFFSET"),
-]
 
 # Uploader
 upload_protocol = env.subst("$UPLOAD_PROTOCOL")
@@ -327,6 +297,7 @@ else:
     sys.stderr.write("Warning! Unknown upload protocol %s\n" % upload_protocol)
 
 # Bootloader library
+boot_all = board.get("build.amb_boot_all")
 target_boot = env.StaticLibrary(
     join("$BUILD_DIR", "boot_all"),
     env.BinToObj(
@@ -339,10 +310,21 @@ env.Prepend(LIBS=[target_boot])
 # Build all libraries
 env.BuildLibraries()
 
-# Main firmware binary builder
-env.Append(
-    BUILDERS=dict(
-        DumpFirmwareBinary=Builder(action=actions),
-    ),
+# Main firmware outputs and actions
+env.Replace(
+    # linker command (dual .bin outputs)
+    LINK="${LINK2BIN} AMBZ xip1 xip2",
+    # default output .bin name
+    IMG_FW="image_${FLASH_OTA1_OFFSET}.ota1.bin",
+    # UF2OTA input list
+    UF2OTA=[
+        (
+            "ota1",
+            "${BUILD_DIR}/image_${FLASH_OTA1_OFFSET}.ota1.bin",
+            "ota2",
+            "${BUILD_DIR}/image_${FLASH_OTA2_OFFSET}.ota2.bin",
+        ),
+    ],
+    # uploader
     UPLOAD_ACTIONS=upload_actions,
 )
diff --git a/builder/main.py b/builder/main.py
index 639cb35..31bbb1b 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -1,5 +1,7 @@
 # Copyright (c) Kuba Szczodrzyński 2022-04-20.
 
+import sys
+
 from SCons.Script import Default, DefaultEnvironment
 
 env = DefaultEnvironment()
@@ -7,6 +9,7 @@ board = env.BoardConfig()
 
 # Utilities
 env.SConscript("utils.py", exports="env")
+env.SConscript("uf2.py", exports="env")
 # Vendor-specific library ports
 env.SConscript("libs/lwip.py", exports="env")
 env.SConscript("libs/flashdb.py", exports="env")
@@ -25,7 +28,6 @@ env.Replace(
     GDB="arm-none-eabi-gdb",
     NM="arm-none-eabi-gcc-nm",
     LINK="arm-none-eabi-gcc",
-    LD="arm-none-eabi-gcc",
     OBJCOPY="arm-none-eabi-objcopy",
     OBJDUMP="arm-none-eabi-objdump",
     # RANLIB="arm-none-eabi-gcc-ranlib",
@@ -53,23 +55,29 @@ if flash_layout:
 # Platform builders details:
 # - call env.AddDefaults("platform name", "sdk name") to add dir paths
 # - call env.AddLibrary("lib name", "base dir", [sources]) to add lib sources
-# - output main firmware image binary as $IMG_FW
 # - call env.BuildLibraries() to build lib targets with safe envs
+# - configure LINK, UF2OTA and UPLOAD_ACTIONS
 # - script code ordering:
 #   - global vars
-#   - # Outputs
 #   - # Tools
 #   - # Flags (C(XX)FLAGS / CPPDEFINES / LINKFLAGS)
 #   - sources (env.AddLibrary)
 #   - # Libs & linker config (LIBPATH / LIBS / LDSCRIPT_PATH)
 #   - # Misc options
-#   - # Image conversion (tools, functions, builders, actions, etc.)
 #   - # Uploader
-#   - # Library targets
+#   - # Bootloader library
 #   - env.BuildLibraries()
-#   - # Main firmware binary builder
+#   - # Main firmware outputs and actions
 
 target_elf = env.BuildProgram()
-target_fw = env.DumpFirmwareBinary("$IMG_FW", target_elf)
-env.AddPlatformTarget("upload", target_fw, env["UPLOAD_ACTIONS"], "Upload")
-Default(target_fw)
+targets = [target_elf]
+
+if "UF2OTA" in env:
+    targets.append(env.BuildUF2OTA(target_elf))
+elif "IMG_FW" in env:
+    target_fw = env.subst("$IMG_FW")
+    env.AddPlatformTarget("upload", target_fw, env["UPLOAD_ACTIONS"], "Upload")
+else:
+    sys.stderr.write("Warning! Firmware outputs not specified.\n")
+
+Default(targets)
diff --git a/builder/uf2.py b/builder/uf2.py
new file mode 100644
index 0000000..c850d60
--- /dev/null
+++ b/builder/uf2.py
@@ -0,0 +1,53 @@
+# Copyright (c) Kuba Szczodrzyński 2022-06-02.
+
+from datetime import datetime
+from os.path import basename, join, normpath
+
+from SCons.Script import Builder, DefaultEnvironment
+
+env = DefaultEnvironment()
+platform = env.PioPlatform()
+
+
+def env_uf2ota(env, *args, **kwargs):
+    now = datetime.now()
+    project_dir = env.subst("$PROJECT_DIR")
+    project_name = basename(normpath(project_dir))
+    # TODO support specifying custom version
+    project_version = now.strftime("%y.%m.%d")
+    lt_version = platform.version
+
+    inputs = " ".join(f'"{";".join(input)}"' for input in env["UF2OTA"])
+    output = [
+        project_name,
+        project_version,
+        "${VARIANT}",
+        "${FAMILY}",
+        f"lt{lt_version}",
+    ]
+    output = join("${BUILD_DIR}", "_".join(output)) + ".uf2"
+
+    cmd = [
+        "@${UF2OTA_PY}",
+        f'--output "{output}"',
+        "--family ${FAMILY}",
+        "--board ${VARIANT}",
+        f"--version {lt_version}",
+        f'--fw "{project_name}:{project_version}"',
+        f"--date {int(now.timestamp())}",
+        "write",
+        inputs,
+    ]
+
+    print(f"|-- {basename(env.subst(output))}")
+
+    env.Execute(" ".join(cmd))
+
+
+env.Append(
+    BUILDERS=dict(
+        BuildUF2OTA=Builder(
+            action=[env.VerboseAction(env_uf2ota, "Building UF2 OTA image")]
+        )
+    )
+)
diff --git a/builder/utils.py b/builder/utils.py
index 535e833..5f084ac 100644
--- a/builder/utils.py
+++ b/builder/utils.py
@@ -32,6 +32,9 @@ def env_add_defaults(env, platform_name: str, sdk_name: str):
         VARIANT=board.get("build.variant"),
         LDSCRIPT_SDK=board.get("build.ldscript_sdk"),
         LDSCRIPT_ARDUINO=board.get("build.ldscript_arduino"),
+        # Link2Bin tool
+        LINK2BIN="${PYTHONEXE} ${LT_DIR}/tools/link2bin.py",
+        UF2OTA_PY="${PYTHONEXE} ${LT_DIR}/tools/uf2ota/uf2ota.py",
     )
     env.Replace(**vars)
     for k, v in vars.items():