diff --git a/boards.txt b/boards.txt
index fa14a1e92a7..9c3a90ccd3e 100644
--- a/boards.txt
+++ b/boards.txt
@@ -3732,6 +3732,160 @@ um_nanos3.menu.EraseFlash.all.upload.erase_cmd=-e
 
 ##############################################################
 
+um_omgs3.name=UM OMGS3
+um_omgs3.vid.0=0x303a
+um_omgs3.pid.0=0x8224
+um_omgs3.upload_port.0.vid=0x303a
+um_omgs3.upload_port.0.pid=0x8224
+
+um_omgs3.bootloader.tool=esptool_py
+um_omgs3.bootloader.tool.default=esptool_py
+
+um_omgs3.upload.tool=esptool_py
+um_omgs3.upload.tool.default=esptool_py
+um_omgs3.upload.tool.network=esp_ota
+
+um_omgs3.upload.maximum_size=1310720
+um_omgs3.upload.maximum_data_size=327680
+um_omgs3.upload.flags=
+um_omgs3.upload.extra_flags=
+um_omgs3.upload.use_1200bps_touch=false
+um_omgs3.upload.wait_for_upload_port=false
+
+um_omgs3.serial.disableDTR=false
+um_omgs3.serial.disableRTS=false
+
+um_omgs3.build.tarch=xtensa
+um_omgs3.build.bootloader_addr=0x0
+um_omgs3.build.target=esp32s3
+um_omgs3.build.mcu=esp32s3
+um_omgs3.build.core=esp32
+um_omgs3.build.variant=um_omgs3
+um_omgs3.build.board=OMGS3
+
+um_omgs3.build.usb_mode=1
+um_omgs3.build.cdc_on_boot=1
+um_omgs3.build.msc_on_boot=0
+um_omgs3.build.dfu_on_boot=0
+um_omgs3.build.f_cpu=240000000L
+um_omgs3.build.flash_size=8MB
+um_omgs3.build.flash_freq=80m
+um_omgs3.build.flash_mode=dio
+um_omgs3.build.boot=qio
+um_omgs3.build.partitions=default
+um_omgs3.build.defines=
+um_omgs3.build.loop_core=
+um_omgs3.build.event_core=
+um_omgs3.build.flash_type=qio
+um_omgs3.build.psram_type=qspi
+um_omgs3.build.memory_type=qio_qspi
+
+um_omgs3.menu.LoopCore.1=Core 1
+um_omgs3.menu.LoopCore.1.build.loop_core=-DARDUINO_RUNNING_CORE=1
+um_omgs3.menu.LoopCore.0=Core 0
+um_omgs3.menu.LoopCore.0.build.loop_core=-DARDUINO_RUNNING_CORE=0
+
+um_omgs3.menu.EventsCore.1=Core 1
+um_omgs3.menu.EventsCore.1.build.event_core=-DARDUINO_EVENT_RUNNING_CORE=1
+um_omgs3.menu.EventsCore.0=Core 0
+um_omgs3.menu.EventsCore.0.build.event_core=-DARDUINO_EVENT_RUNNING_CORE=0
+
+um_omgs3.menu.USBMode.hwcdc=Hardware CDC and JTAG
+um_omgs3.menu.USBMode.hwcdc.build.usb_mode=1
+um_omgs3.menu.USBMode.default=USB-OTG (TinyUSB)
+um_omgs3.menu.USBMode.default.build.usb_mode=0
+
+um_omgs3.menu.CDCOnBoot.cdc=Enabled
+um_omgs3.menu.CDCOnBoot.cdc.build.cdc_on_boot=1
+um_omgs3.menu.CDCOnBoot.default=Disabled
+um_omgs3.menu.CDCOnBoot.default.build.cdc_on_boot=0
+
+um_omgs3.menu.MSCOnBoot.default=Disabled
+um_omgs3.menu.MSCOnBoot.default.build.msc_on_boot=0
+um_omgs3.menu.MSCOnBoot.msc=Enabled (Requires USB-OTG Mode)
+um_omgs3.menu.MSCOnBoot.msc.build.msc_on_boot=1
+
+um_omgs3.menu.DFUOnBoot.default=Disabled
+um_omgs3.menu.DFUOnBoot.default.build.dfu_on_boot=0
+um_omgs3.menu.DFUOnBoot.dfu=Enabled (Requires USB-OTG Mode)
+um_omgs3.menu.DFUOnBoot.dfu.build.dfu_on_boot=1
+
+um_omgs3.menu.UploadMode.cdc.upload.wait_for_upload_port=true
+um_omgs3.menu.UploadMode.default=UART0 / Hardware CDC
+um_omgs3.menu.UploadMode.cdc=USB-OTG CDC (TinyUSB)
+um_omgs3.menu.UploadMode.cdc.upload.use_1200bps_touch=true
+um_omgs3.menu.UploadMode.default.upload.use_1200bps_touch=false
+um_omgs3.menu.UploadMode.default.upload.wait_for_upload_port=false
+
+um_omgs3.menu.PSRAM.enabled=Enabled
+um_omgs3.menu.PSRAM.enabled.build.defines=-DBOARD_HAS_PSRAM
+um_omgs3.menu.PSRAM.disabled=Disabled
+um_omgs3.menu.PSRAM.disabled.build.defines=
+
+um_omgs3.menu.PartitionScheme.default_8MB=Default (3MB APP/1.5MB SPIFFS)
+um_omgs3.menu.PartitionScheme.default_8MB.build.partitions=default_8MB
+um_omgs3.menu.PartitionScheme.default_8MB.upload.maximum_size=3342336
+um_omgs3.menu.PartitionScheme.tinyuf2=TinyUF2 Compatibility (2MB APP/3.7MB FFAT)
+um_omgs3.menu.PartitionScheme.tinyuf2.build.custom_bootloader=bootloader_tinyuf2
+um_omgs3.menu.PartitionScheme.tinyuf2.build.custom_partitions=partitions_tinyuf2
+um_omgs3.menu.PartitionScheme.tinyuf2.upload.extra_flags=0x410000 "{runtime.platform.path}/variants/{build.variant}/tinyuf2.bin"
+um_omgs3.menu.PartitionScheme.tinyuf2.upload.maximum_size=2097152
+
+um_omgs3.menu.CPUFreq.240=240MHz (WiFi)
+um_omgs3.menu.CPUFreq.240.build.f_cpu=240000000L
+um_omgs3.menu.CPUFreq.160=160MHz (WiFi)
+um_omgs3.menu.CPUFreq.160.build.f_cpu=160000000L
+um_omgs3.menu.CPUFreq.80=80MHz (WiFi)
+um_omgs3.menu.CPUFreq.80.build.f_cpu=80000000L
+um_omgs3.menu.CPUFreq.40=40MHz
+um_omgs3.menu.CPUFreq.40.build.f_cpu=40000000L
+um_omgs3.menu.CPUFreq.20=20MHz
+um_omgs3.menu.CPUFreq.20.build.f_cpu=20000000L
+um_omgs3.menu.CPUFreq.10=10MHz
+um_omgs3.menu.CPUFreq.10.build.f_cpu=10000000L
+
+um_omgs3.menu.FlashMode.qio=QIO
+um_omgs3.menu.FlashMode.qio.build.flash_mode=dio
+um_omgs3.menu.FlashMode.qio.build.boot=qio
+um_omgs3.menu.FlashMode.dio=DIO
+um_omgs3.menu.FlashMode.dio.build.flash_mode=dio
+um_omgs3.menu.FlashMode.dio.build.boot=dio
+
+um_omgs3.menu.UploadSpeed.921600=921600
+um_omgs3.menu.UploadSpeed.921600.upload.speed=921600
+um_omgs3.menu.UploadSpeed.115200=115200
+um_omgs3.menu.UploadSpeed.115200.upload.speed=115200
+um_omgs3.menu.UploadSpeed.256000.windows=256000
+um_omgs3.menu.UploadSpeed.256000.upload.speed=256000
+um_omgs3.menu.UploadSpeed.230400.windows.upload.speed=256000
+um_omgs3.menu.UploadSpeed.230400=230400
+um_omgs3.menu.UploadSpeed.230400.upload.speed=230400
+um_omgs3.menu.UploadSpeed.460800.linux=460800
+um_omgs3.menu.UploadSpeed.460800.macosx=460800
+um_omgs3.menu.UploadSpeed.460800.upload.speed=460800
+um_omgs3.menu.UploadSpeed.512000.windows=512000
+um_omgs3.menu.UploadSpeed.512000.upload.speed=512000
+
+um_omgs3.menu.DebugLevel.none=None
+um_omgs3.menu.DebugLevel.none.build.code_debug=0
+um_omgs3.menu.DebugLevel.error=Error
+um_omgs3.menu.DebugLevel.error.build.code_debug=1
+um_omgs3.menu.DebugLevel.warn=Warn
+um_omgs3.menu.DebugLevel.warn.build.code_debug=2
+um_omgs3.menu.DebugLevel.info=Info
+um_omgs3.menu.DebugLevel.info.build.code_debug=3
+um_omgs3.menu.DebugLevel.debug=Debug
+um_omgs3.menu.DebugLevel.debug.build.code_debug=4
+um_omgs3.menu.DebugLevel.verbose=Verbose
+um_omgs3.menu.DebugLevel.verbose.build.code_debug=5
+
+um_omgs3.menu.EraseFlash.none=Disabled
+um_omgs3.menu.EraseFlash.none.upload.erase_cmd=
+um_omgs3.menu.EraseFlash.all=Enabled
+um_omgs3.menu.EraseFlash.all.upload.erase_cmd=-e
+
+##############################################################
+
 um_pros3.name=UM PROS3
 um_pros3.vid.0=0x303a
 um_pros3.pid.0=0x80D3
diff --git a/variants/um_omgs3/bootloader_tinyuf2.bin b/variants/um_omgs3/bootloader_tinyuf2.bin
new file mode 100644
index 00000000000..84bab25be27
Binary files /dev/null and b/variants/um_omgs3/bootloader_tinyuf2.bin differ
diff --git a/variants/um_omgs3/partitions_tinyuf2.csv b/variants/um_omgs3/partitions_tinyuf2.csv
new file mode 100644
index 00000000000..4026378b6fb
--- /dev/null
+++ b/variants/um_omgs3/partitions_tinyuf2.csv
@@ -0,0 +1,10 @@
+# ESP-IDF Partition Table
+# Name,   Type, SubType, Offset,  Size, Flags
+# bootloader.bin,,          0x1000, 32K
+# partition table,,         0x8000, 4K
+nvs,      data, nvs,      0x9000,  20K,
+otadata,  data, ota,      0xe000,  8K,
+ota_0,    0,    ota_0,   0x10000,  2048K,
+ota_1,    0,    ota_1,  0x210000,  2048K,
+uf2,      app,  factory,0x410000,  256K,
+ffat,     data, fat,    0x450000,  3776K,
diff --git a/variants/um_omgs3/pins_arduino.h b/variants/um_omgs3/pins_arduino.h
new file mode 100644
index 00000000000..81164c48efe
--- /dev/null
+++ b/variants/um_omgs3/pins_arduino.h
@@ -0,0 +1,59 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+#include "soc/soc_caps.h"
+
+#define USB_VID          0x303A
+#define USB_PID          0x8224
+#define USB_MANUFACTURER "Unexpected Maker"
+#define USB_PRODUCT      "OMGS3"
+#define USB_SERIAL       ""
+
+static const uint8_t TX = 43;
+static const uint8_t RX = 44;
+
+static const uint8_t SDA = 8;
+static const uint8_t SCL = 9;
+
+static const uint8_t SS = 3;
+static const uint8_t MOSI = 6;
+static const uint8_t MISO = 5;
+static const uint8_t SDO = 6;
+static const uint8_t SDI = 5;
+static const uint8_t SCK = 4;
+
+static const uint8_t A0 = 1;
+static const uint8_t A1 = 2;
+static const uint8_t A2 = 3;
+static const uint8_t A3 = 4;
+static const uint8_t A4 = 5;
+static const uint8_t A5 = 6;
+static const uint8_t A6 = 7;
+static const uint8_t A7 = 8;
+static const uint8_t A8 = 9;
+
+static const uint8_t T1 = 1;
+static const uint8_t T2 = 2;
+static const uint8_t T3 = 3;
+static const uint8_t T4 = 4;
+static const uint8_t T5 = 5;
+static const uint8_t T6 = 6;
+static const uint8_t T7 = 7;
+static const uint8_t T8 = 8;
+static const uint8_t T9 = 9;
+
+static const uint8_t VBUS_SENSE = 33;
+
+static const uint8_t RGB_DATA = 35;
+// RGB_BUILTIN and RGB_BRIGHTNESS can be used in new Arduino API rgbLedWrite()
+#define RGB_BUILTIN    (RGB_DATA + SOC_GPIO_PIN_COUNT)
+#define RGB_BRIGHTNESS 64
+// BUILTIN_LED can be used in new Arduino API digitalWrite() like in Blink.ino
+static const uint8_t LED_BUILTIN = RGB_BUILTIN;
+#define BUILTIN_LED LED_BUILTIN  // backward compatibility
+#define LED_BUILTIN LED_BUILTIN  // allow testing #ifdef LED_BUILTIN
+
+static const uint8_t RGB_PWR = 34;
+
+#endif /* Pins_Arduino_h */
diff --git a/variants/um_omgs3/tinyuf2.bin b/variants/um_omgs3/tinyuf2.bin
new file mode 100644
index 00000000000..fccd2906393
Binary files /dev/null and b/variants/um_omgs3/tinyuf2.bin differ