Online ESP32 Flasher

FastBee-Arduino 烧录工具

选择串口和合并固件后，即可执行擦除或烧录操作，日志会实时显示连接和写入状态。

未连接

连接配置

波特率115200230400460800921600

连接串口

烧录文件

请选择合并固件ESP32 / 4MB Flash / 0MB PSRAM - fastbee-esp32-F4R0.binESP32 / 8MB Flash / 4MB PSRAM - fastbee-esp32-F8R4.binESP32S3 / 8MB Flash / 0MB PSRAM - fastbee-esp32s3-F8R0.binESP32S3 / 8MB Flash / 4MB PSRAM - fastbee-esp32s3-F8R4.binESP32S3 / 16MB Flash / 8MB PSRAM - fastbee-esp32s3-F16R8.binESP32C3 / 4MB Flash / 0MB PSRAM - fastbee-esp32c3-F4R0.binESP32C6 / 4MB Flash / 0MB PSRAM - fastbee-esp32c6-F4R0.bin

固件来源内置文件本地文件

高级选项

Flash 模式DIOQIODOUTQOUT建议保持 DIO；只有固件编译配置明确要求时再改为 QIO、DOUT 或 QOUT。Flash 频率40 MHz80 MHz26 MHz20 MHz建议保持 40 MHz；80 MHz 需要板卡和固件配置同时支持。Flash 大小自动检测4MB8MB16MB优先使用自动检测；检测失败或分区表固定时选择实际 Flash 容量。

自动复位默认启用，便于自动进入下载模式；透传升级或需手动按键下载时可关闭。

执行操作

日志窗口

已加载 7 个内置烧录文件。
等待选择串口。

Quick Start

Step	Action	Details
1	Connect the board	Use a USB data cable (not a charge-only cable)
2	Select serial port	Click the serial-port button and choose the board port in the browser dialog
3	Pick firmware & flash	Select the matching merged firmware from the dropdown, then click Flash

After flashing, the device restarts automatically. If it does not, press EN or RST to reboot manually.

Tool Layout

The tool is split into two panels:

Left — Configuration Panel

• Connection: Baud rate selector (default 115200), serial port connect/disconnect button. The top-right corner shows the connection status (Connected / Disconnected).
• Flash Files: Firmware source switch (Built-in / Local), firmware dropdown or local .bin file picker, flash address input (default 0x0). In local mode you can add or remove file rows.
• Advanced Options (collapsed): Flash mode, Flash frequency, Flash size, and auto-reset toggle.

Right — Execution Panel

• Action Buttons: Erase (clear Flash) and Flash (write firmware).
• Progress Bar: Real-time flash progress percentage.
• Log Window: Connection, write, and verification status with a clear button.

Built-In Firmware Selection

Built-in firmware images are loaded from fim/manifest.json next to this page. Each image is a merged firmware (bootloader + partition table + application + Web filesystem) with flash address 0x0 — a single write covers everything.

Chip	Firmware	Flash	PSRAM	Typical Board
ESP32	fastbee-esp32-F4R0	4 MB	None	ESP32-DevKitC and similar
ESP32	fastbee-esp32-F8R4	8 MB	4 MB	ESP32-WROVER series
ESP32-S3	fastbee-esp32s3-F8R0	8 MB	None	ESP32-S3-DevKitC-1 (N8)
ESP32-S3	fastbee-esp32s3-F8R4	8 MB	4 MB	ESP32-S3-WROOM-1 (N8R4)
ESP32-S3	fastbee-esp32s3-F16R8	16 MB	8 MB	ESP32-S3-WROOM-1 (N16R8)
ESP32-C3	fastbee-esp32c3-F4R0	4 MB	None	ESP32-C3-DevKitM-1
ESP32-C6	fastbee-esp32c6-F4R0	4 MB	None	ESP32-C6-DevKitC-1

How to check Flash and PSRAM size? Look at the chip info in Arduino IDE's Tools menu, or inspect the boot log via serial monitor for chip: and flash: lines.

Firmware Naming Convention

In the filename, F stands for Flash size and R stands for PSRAM size:

• F4R0 → 4 MB Flash, no PSRAM
• F8R4 → 8 MB Flash, 4 MB PSRAM
• F16R8 → 16 MB Flash, 8 MB PSRAM

Detailed Instructions

Connection

1. Connect the development board to your computer with a USB data cable.
2. Select the baud rate from the dropdown — 115200, 230400, 460800, or 921600. Keep 115200 when the connection is unstable.
3. Click the serial-port button and choose the board port in the browser dialog. The status indicator in the top-right corner changes to "Connected" on success.

Flash Files

4. Choose the firmware source:
   • Built-in: Reads merged firmware from the fim directory; the dropdown lists all available images.
   • Local: Manually select .bin files; you can add or remove file rows.
5. In built-in mode, select the merged firmware that matches the chip, Flash size, and PSRAM size. Keep the address at 0x0.
6. In local mode, click the file button to choose a .bin file and enter the flash address. Click "Add File" to flash multiple files.

Advanced Options

Advanced options are collapsed by default and usually do not need changes:

Option	Default	Notes
Flash Mode	DIO	Keep DIO unless the firmware build explicitly requires QIO, DOUT, or QOUT
Flash Frequency	40 MHz	Keep 40 MHz; 80 MHz requires both board and firmware support
Flash Size	Auto-match	Automatically set from the F suffix when using built-in firmware; manual options: 4MB / 8MB / 16MB
Auto Reset	Enabled	Enters download mode automatically; disable for transparent upgrades or manual button entry

Execution

7. To clear previous configuration, click Erase first. Erase wipes the entire Flash, including network settings, runtime parameters, and stored data.
8. After confirming the firmware selection, click Flash. The progress bar and log window show write status in real time.
9. After flashing, the device restarts automatically. If it does not, press EN or RST to reboot.

Important Notes

1. Firmware matching: Always verify that the chip model, Flash size, and PSRAM size in the merged firmware match the board.
2. Merged firmware address: Merged firmware writes from 0x0 and includes bootloader, partition table, application, and Web filesystem — no additional images are needed.
3. Erase impact: Erasing Flash removes all device configuration and data. Back up settings before erasing.
4. Auto reset: Enabled by default for boards with auto-download circuits. Disable for transparent upgrades or boards without compatible reset circuitry.

Browser Requirements

1. Use a recent Chrome or Edge browser.
2. Web Serial API requires HTTPS. Local development can use localhost.
3. If the serial-port dialog does not appear, check browser serial permissions, USB drivers, and whether the cable supports data transfer.

Troubleshooting

The Browser Does Not Support Serial Access

Switch to Chrome or Edge and make sure the page is served through HTTPS. Some Chromium-based browsers may have disabled the serial capability.

No Serial Port Is Listed

• Check that the USB cable supports data transfer (not a charge-only cable).
• Confirm the serial driver is installed. On Windows, the device usually appears as USB-SERIAL CH340, CP210x USB to UART Bridge, or a similar adapter in Device Manager.
• Make sure no other program (e.g., Arduino IDE Serial Monitor) is using the same port.

Flashing Keeps Waiting for Sync

If automatic reset does not work, hold BOOT, start flashing, and release after writing begins. If it still fails, press EN or RST and retry.

The Device Does Not Come Online After Flashing

Confirm Wi-Fi, MQTT, product, and credential settings in the firmware. Use serial logs to inspect connection errors. If another firmware was flashed before, erase Flash and write the complete merged image again.

The Web Console Is Missing or Broken

Confirm that the selected file is a complete merged image and that its chip, Flash, and PSRAM profile matches the board. If you use a custom partition layout or build your own package, regenerate the merged image with the Web filesystem resources included.