Broaden device scope: any STM32 with USB DFU ROM bootloader

- UI title/heading: STM32F723 → STM32 (generic)
- README: compatibility section with tested (F723) and expected-to-work
  device table; note on USB-capable variants and protocol limitation
- README: DFU mode instructions note board-specific BOOT button variants
- .github/ISSUE_TEMPLATE: device-validation.md for community reports

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: AmeNote-Michael

.github/ISSUE_TEMPLATE/device-validation.md

@@ -0,0 +1,32 @@
+---
+name: Device validation report
+about: Report that you have tested this tool on a specific STM32 device
+title: "Validation: STM32[series] — [works / partial / does not work]"
+labels: validation
+assignees: ''
+---
+
+**Device / part number**
+e.g. STM32F407VG, STM32H743ZI
+
+**Development board (if applicable)**
+e.g. STM32F4DISCOVERY, Nucleo-H743ZI2, custom PCB
+
+**Firmware file type used**
+- [ ] `.hex` (Intel HEX)
+- [ ] `.bin` (binary)
+
+**Result**
+- [ ] Works fully (erase, write, verify, reset all pass)
+- [ ] Partial (describe below)
+- [ ] Does not work (describe below)
+
+**Tested with**
+- [ ] Chrome browser + local HTTP server
+- [ ] Electron desktop app
+
+**OS**
+e.g. macOS 15, Windows 11, Ubuntu 24.04
+
+**Notes**
+Any error messages, unexpected behaviour, or observations (e.g. sector map was auto-detected / fell back to default).

README.md

@@ -1,13 +1,45 @@
 # STM32 Web Programmer
 
-Browser-based flash programmer for the STM32F723 (and compatible STM32F72x/73x devices). Uses the factory ROM bootloader over USB DFU — no drivers, no desktop software required.
+Browser-based flash programmer for STM32 microcontrollers that expose the factory ROM bootloader over USB DFU. No drivers, no desktop software, no installation required.
 
 **Accepts:** `.hex` (Intel HEX) or `.bin` files  
 **Erases:** only the flash sectors touched by the file — all other flash is left intact  
 **Browser:** Google Chrome (web), or the standalone Electron app (macOS / Windows / Linux)
 
 ---
 
+## Device compatibility
+
+The tool communicates using ST's **DfuSe** protocol over the standard ROM USB DFU bootloader (VID `0x0483` / PID `0xDF11`). The flash sector map is read automatically from the DfuSe interface string descriptor, so any device that correctly exposes that descriptor should work without changes.
+
+### Tested
+
+| Device | Board | Result |
+|--------|-------|--------|
+| STM32F723 | Custom PCB | ✅ Fully working |
+
+### Expected to work
+
+These devices share the same ROM bootloader protocol. They have not yet been independently validated — community reports welcome (see below).
+
+| Series | Example parts |
+|--------|---------------|
+| STM32F2 | F205, F207, F215, F217 |
+| STM32F4 | F401, F405, F407, F411, F429, F446, F469 |
+| STM32F7 | F722, F730, F745, F746, F756, F765, F767, F769, F777 |
+| STM32H7 | H723, H743, H745, H750, H753, H755, H757 |
+| STM32L4 | L433, L475, L476, L496 (USB-capable variants) |
+| STM32G4 | G431, G474, G491 (USB-capable variants) |
+| STM32U5 | U535, U545, U575, U585 |
+
+> **Note:** Only STM32 devices with a USB Full-Speed or High-Speed peripheral and a DFU-capable ROM bootloader are supported. Devices that use UART/I²C DFU or require a separate ST-LINK connection are not supported.
+
+### Report your device
+
+If you have tested this tool on a device not listed above, please [open a validation issue](../../issues/new?template=device-validation.md) with your results. Reports help build a verified compatibility list for the community.
+
+---
+
 ## Electron desktop app (recommended)
 
 The Electron build runs as a native desktop app — no browser, no HTTP server, no Chrome required. USB device access is granted automatically.
@@ -144,7 +176,9 @@ Leave the terminal open while you use the tool. Press `Ctrl+C` to stop the serve
 
 ### 1. Put the STM32 into DFU mode
 
-1. Pull **BOOT0** high (connect to VCC via a solder bridge, switch, or jumper).
+The exact method varies by device, but the general approach is:
+
+1. Pull **BOOT0** high (connect to VCC via a solder bridge, switch, or jumper). Some boards have a dedicated BOOT button — hold it while resetting.
 2. **Reset** the device (press the reset button or cycle power).
 3. The STM32 enumerates as a USB DFU device — no firmware is running at this point.
 

index.html

@@ -3,14 +3,14 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>STM32F723 Programmer</title>
+  <title>STM32 Programmer</title>
   <link rel="stylesheet" href="style.css">
 </head>
 <body>
 <div class="container">
 
   <div>
-    <h1>STM32F723 Flash Programmer</h1>
+    <h1>STM32 Flash Programmer</h1>
     <p class="subtitle">USB DFU (DfuSe) via WebUSB &mdash; Chrome or Electron desktop app</p>
   </div>