diff --git a/README.md b/README.md
index 2abc519..11564c0 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,18 @@ pio run -e cyd_28r -t upload
 pio device monitor -b 115200
 ```
 
+### 预编译固件（随时刷，不必编译）
+
+已归档到 [`firmware/cyd_28r/`](firmware/cyd_28r/)（含 bootloader / partitions / app）：
+
+```powershell
+cd firmware\cyd_28r
+.\flash.ps1
+# 或 .\flash.ps1 -Port COM3
+```
+
+说明见 [`firmware/README.md`](firmware/README.md)。源码更新后重新打包：`.\firmware\export_from_build.ps1`。
+
 ### 环境选择
 
 | 环境 | 适用 |
@@ -66,6 +78,7 @@ platformio.ini                 # 板级与库依赖
 include/lv_conf.h              # LVGL 配置
 src/main.cpp                   # 仪表盘主程序
 scripts/exclude_lvgl_asm.py    # 排除 ESP32 不兼容的 LVGL ASM
+firmware/                      # 预编译固件（可离线刷写）
 cad/                           # 3D 外壳（OpenSCAD + STL）
 .cursor/rules/                 # Cursor 协作规则
 README.md                      # 本文档
@@ -123,3 +136,4 @@ git reset --hard v1.1-case-snaps
 | 2026-10-17 | 打标签 `v1.1-case-snaps`（及分支 `keep/v1.1-case-snaps`）作为可回滚稳定版 |
 | 2026-10-17 | UI 重排：修文字压图表；表盘/底栏分区；动画与短按/长按交互 |
 | 2026-10-17 | 顶栏改单行，避免 up 文案被表盘面板盖住 |
+| 2026-10-17 | 归档预编译固件到 `firmware/cyd_28r/`，附一键刷写脚本 |
diff --git a/firmware/README.md b/firmware/README.md
new file mode 100644
index 0000000..030d949
--- /dev/null
+++ b/firmware/README.md
@@ -0,0 +1,46 @@
+# 预编译固件（可随时刷写）
+
+当前归档目录：[`cyd_28r/`](cyd_28r/)
+
+对应板子：**CYD ESP32-2432S028R**（ILI9341），DHT11 → GPIO22。  
+版本信息见 [`cyd_28r/VERSION.txt`](cyd_28r/VERSION.txt)。
+
+## 直接刷写（无需重新编译）
+
+1. USB 连接板子  
+2. 在本目录执行：
+
+```powershell
+cd firmware\cyd_28r
+.\flash.ps1
+# 或指定端口
+.\flash.ps1 -Port COM3
+```
+
+也可双击 / 运行 `flash.bat`。
+
+依赖其一即可：
+
+- 已安装 PlatformIO（`pio`，自带 esptool）
+- 或 `pip install esptool`
+
+## 手动 esptool
+
+```bash
+esptool.py --chip esp32 --port COM3 --baud 921600 write_flash -z ^
+  --flash_mode dio --flash_freq 40m --flash_size 4MB ^
+  0x1000 bootloader.bin ^
+  0x8000 partitions.bin ^
+  0xe000 boot_app0.bin ^
+  0x10000 firmware.bin
+```
+
+## 从源码重新打包进本目录
+
+在仓库根目录：
+
+```powershell
+.\firmware\export_from_build.ps1
+# 仅复制、不编译：
+.\firmware\export_from_build.ps1 -SkipBuild
+```
diff --git a/firmware/cyd_28r/VERSION.txt b/firmware/cyd_28r/VERSION.txt
new file mode 100644
index 0000000..d3830ab
--- /dev/null
+++ b/firmware/cyd_28r/VERSION.txt
@@ -0,0 +1,16 @@
+name: CYD climate dashboard (cyd_28r)
+git: 3173b5f
+date: 2026-10-17
+board: ESP32-2432S028R (ILI9341)
+dht: GPIO22
+flash_size: 4MB
+offsets:
+  0x1000  bootloader.bin
+  0x8000  partitions.bin
+  0xe000  boot_app0.bin
+  0x10000 firmware.bin
+sha256:
+  bootloader.bin  3D234A7471F67B013686DABD4DEE7C1FA915C9928463616A94BC9297ACF1ABF8
+  partitions.bin  0A8B5720E7B77FF11F1462458C3A509DEE79224E5279898F26D6A2E3AE0517B7
+  boot_app0.bin   F94C5D786A7A8FAB06AC5D10E33BF37711A6697636DC037559EA19CC410A17F0
+  firmware.bin    136CDB0949D3B74DF14ACBB8A2ED100C6F6934BEBE6290639E9C4CD1E68582F4
diff --git a/firmware/cyd_28r/boot_app0.bin b/firmware/cyd_28r/boot_app0.bin
new file mode 100644
index 0000000..13562ca
Binary files /dev/null and b/firmware/cyd_28r/boot_app0.bin differ
diff --git a/firmware/cyd_28r/bootloader.bin b/firmware/cyd_28r/bootloader.bin
new file mode 100644
index 0000000..d592359
Binary files /dev/null and b/firmware/cyd_28r/bootloader.bin differ
diff --git a/firmware/cyd_28r/firmware.bin b/firmware/cyd_28r/firmware.bin
new file mode 100644
index 0000000..5a35ad4
Binary files /dev/null and b/firmware/cyd_28r/firmware.bin differ
diff --git a/firmware/cyd_28r/flash.bat b/firmware/cyd_28r/flash.bat
new file mode 100644
index 0000000..bf983b3
--- /dev/null
+++ b/firmware/cyd_28r/flash.bat
@@ -0,0 +1,5 @@
+@echo off
+setlocal
+cd /d "%~dp0"
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0flash.ps1" %*
+exit /b %ERRORLEVEL%
diff --git a/firmware/cyd_28r/flash.ps1 b/firmware/cyd_28r/flash.ps1
new file mode 100644
index 0000000..6a4251b
--- /dev/null
+++ b/firmware/cyd_28r/flash.ps1
@@ -0,0 +1,84 @@
+# Flash archived CYD climate firmware (no rebuild needed)
+# Usage:
+#   .\flash.ps1
+#   .\flash.ps1 -Port COM5
+#   .\flash.ps1 -Port COM5 -Baud 460800
+
+param(
+  [string]$Port = "",
+  [int]$Baud = 921600
+)
+
+$ErrorActionPreference = "Stop"
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $here
+
+function Find-Esptool {
+  $pio = Get-Command pio -ErrorAction SilentlyContinue
+  if ($pio) {
+    $pkg = Join-Path $env:USERPROFILE ".platformio\packages\tool-esptoolpy\esptool.py"
+    if (Test-Path $pkg) { return @{ Kind = "py"; Path = $pkg } }
+  }
+  $py = Get-Command python -ErrorAction SilentlyContinue
+  if ($py) {
+    try {
+      & python -c "import esptool" 2>$null
+      if ($LASTEXITCODE -eq 0) { return @{ Kind = "mod"; Path = "esptool" } }
+    } catch {}
+  }
+  $esp = Get-Command esptool.py -ErrorAction SilentlyContinue
+  if ($esp) { return @{ Kind = "py"; Path = $esp.Source } }
+  return $null
+}
+
+if (-not $Port) {
+  $ports = @()
+  try {
+    Add-Type -AssemblyName System.IO.Ports -ErrorAction SilentlyContinue | Out-Null
+    $ports = [System.IO.Ports.SerialPort]::GetPortNames() | Sort-Object
+  } catch {}
+  if (-not $ports -or $ports.Count -eq 0) {
+    $ports = Get-CimInstance Win32_SerialPort -ErrorAction SilentlyContinue |
+      Select-Object -ExpandProperty DeviceID | Sort-Object
+  }
+  if (-not $ports -or $ports.Count -eq 0) {
+    Write-Error "No serial ports found. Plug in the CYD USB cable, then retry with -Port COMx"
+  }
+  if ($ports.Count -eq 1) {
+    $Port = $ports[0]
+  } else {
+    Write-Host "Available ports: $($ports -join ', ')"
+    $Port = $ports[-1]
+    Write-Host "Using last port: $Port (override with -Port)"
+  }
+}
+
+$tool = Find-Esptool
+if (-not $tool) {
+  Write-Error "esptool not found. Install PlatformIO (`pio`) or: pip install esptool"
+}
+
+$argsCommon = @(
+  "--chip", "esp32",
+  "--port", $Port,
+  "--baud", "$Baud",
+  "--before", "default_reset",
+  "--after", "hard_reset",
+  "write_flash", "-z",
+  "--flash_mode", "dio",
+  "--flash_freq", "40m",
+  "--flash_size", "4MB",
+  "0x1000", "bootloader.bin",
+  "0x8000", "partitions.bin",
+  "0xe000", "boot_app0.bin",
+  "0x10000", "firmware.bin"
+)
+
+Write-Host "Flashing $here -> $Port @ $Baud"
+if ($tool.Kind -eq "mod") {
+  & python -m esptool @argsCommon
+} else {
+  & python $tool.Path @argsCommon
+}
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+Write-Host "Done. Open serial monitor at 115200 if needed."
diff --git a/firmware/cyd_28r/partitions.bin b/firmware/cyd_28r/partitions.bin
new file mode 100644
index 0000000..21800fa
Binary files /dev/null and b/firmware/cyd_28r/partitions.bin differ
diff --git a/firmware/export_from_build.ps1 b/firmware/export_from_build.ps1
new file mode 100644
index 0000000..44a1f80
--- /dev/null
+++ b/firmware/export_from_build.ps1
@@ -0,0 +1,52 @@
+# Rebuild (optional) and refresh firmware/cyd_28r from PlatformIO build output.
+# Usage:
+#   .\firmware\export_from_build.ps1
+#   .\firmware\export_from_build.ps1 -SkipBuild
+
+param([switch]$SkipBuild)
+
+$ErrorActionPreference = "Stop"
+$root = Split-Path -Parent (Split-Path -Parent $MyInvocation.MyCommand.Path)
+Set-Location $root
+
+if (-not $SkipBuild) {
+  pio run -e cyd_28r
+  if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+}
+
+$src = Join-Path $root ".pio\build\cyd_28r"
+$dst = Join-Path $root "firmware\cyd_28r"
+New-Item -ItemType Directory -Force -Path $dst | Out-Null
+
+Copy-Item (Join-Path $src "bootloader.bin") $dst -Force
+Copy-Item (Join-Path $src "partitions.bin") $dst -Force
+Copy-Item (Join-Path $src "firmware.bin") $dst -Force
+
+$bootApp = Join-Path $env:USERPROFILE ".platformio\packages\framework-arduinoespressif32\tools\partitions\boot_app0.bin"
+if (-not (Test-Path $bootApp)) {
+  Write-Error "boot_app0.bin not found under PlatformIO packages"
+}
+Copy-Item $bootApp (Join-Path $dst "boot_app0.bin") -Force
+
+$git = (git -C $root rev-parse --short HEAD).Trim()
+$date = Get-Date -Format "yyyy-MM-dd"
+$hashes = Get-FileHash (Join-Path $dst "*.bin") -Algorithm SHA256
+$lines = @(
+  "name: CYD climate dashboard (cyd_28r)",
+  "git: $git",
+  "date: $date",
+  "board: ESP32-2432S028R (ILI9341)",
+  "dht: GPIO22",
+  "flash_size: 4MB",
+  "offsets:",
+  "  0x1000  bootloader.bin",
+  "  0x8000  partitions.bin",
+  "  0xe000  boot_app0.bin",
+  "  0x10000 firmware.bin",
+  "sha256:"
+)
+foreach ($h in $hashes) {
+  $lines += ("  {0,-15} {1}" -f (Split-Path $h.Path -Leaf), $h.Hash)
+}
+$lines | Set-Content -Encoding utf8 (Join-Path $dst "VERSION.txt")
+Write-Host "Exported -> $dst (git $git)"