Firmware downloads
Choose the build that matches your hardware and update strategy. All images are built from the GitHub repository.
Versioning and file system compatibility
The last letter/number of the version encodes the internal file system version (A/B: SPIFFS on legacy builds, C: LittleFS).
- If the first (upper‑case) letter changes, this version is incompatible with previous versions and you must flash the full image.
-
If only the second part (number) changes, the file
system layout has changed (web UI, display layout, …). These changes
are not included in a code‑only update (
update.binflash), but they should not break existing installations.
Types of images
- Full image: full install, overwrites any existing configuration.
- Code update: keeps the internal file system unchanged and only updates the application code.
- update.fs.bin: OTA file‑system update; updates selected system files while keeping configuration files unchanged.
Main builds
(Better) tested images, infrequent updates.
| Version | Type | Download |
|---|---|---|
main0.98-C3 |
Full image | main0.98-C3-full.bin |
| Jul 10 02:21:39 2025 lets activate the main branch... | ||
main0.98-C3 |
Code update | update.ino.bin |
main0.98-C3 |
Filesystem update | update.fs.bin |
Development builds
Frequeny updates, for testing new features, sometimes only lightly tested. Expect occasional breakage.
| Version | Type | Download |
|---|---|---|
dev20260221-C3 |
Full image | dev20260221-C3-full.bin |
| Feb 25 02:16:04 2026 version update; modified flexible url handling for rinex; modified flexible url handling for rinex | ||
dev20260221-C3 |
Code update | update.ino.bin |
dev20260221-C3 |
Filesystem update | update.fs.bin |
dev20260219-C3 |
Full image | dev20260219-C3-full.bin |
| Feb 20 19:04:52 2026 mqtt: last will topic must not be on stack, it will be used later asynchronously. sdcard: proper flush | ||
dev20260218-C3 |
Full image | dev20260218-C3-full.bin |
| Feb 19 04:07:49 2026 sdcard subdir handling per month and newer idf version | ||
dev20251120-C3 |
Full image | dev20251120-C3-full.bin |
| Nov 21 00:21:25 2025 fix stupid bug that broke display handling on M5 Core / Core2; fix mqtt problem #553 | ||
dev20250822-C3 |
Full image | dev20250822-C3-full.bin |
| Aug 23 03:24:17 2025 large scanner for large TFT display (4") | ||
dev20250523b-C3 |
Full image | dev20250523b-C3-full.bin |
| Jul 09 16:25:44 2025 re-generate image | ||
dev20250523-C3 |
Full image | dev20250523-C3-full.bin |
| May 24 02:41:04 2025 added function for formatting SD card; | ||
dev20250516-C3 |
Full image | dev20250516-C3-full.bin |
| May 17 03:15:26 2025 added support for ST7796S (untested) | ||
dev20250506-C3 |
Full image | dev20250506-C3-full.bin |
| May 06 16:50:04 2025 posinfo update - always use GPS if no fixed position is defined | ||
dev20250504-C3 |
Full image | dev20250504-C3-full.bin |
| May 04 22:29:22 2025 use rx time stamp for prediction (fix #490) | ||
dev20250401-C3 |
Full image | dev20250401-C3-full.bin |
| Apr 01 18:58:46 2025 DFM update | ||
dev20250218-C3 |
Full image | dev20250218-C3-full.bin |
| Feb 18 18:59:02 2025 added M20 voltage | ||
dev20250210-C3 |
Full image | dev20250210-C3-full.bin |
| Feb 11 23:45:17 2025 make sh import without sh enabled work again | ||
dev20250208-C3 |
Full image | dev20250208-C3-full.bin |
| Feb 08 18:55:04 2025 get time right (utc vs gps time); fix merge error | ||
dev20250205-C3 |
Full image | dev20250205-C3-full.bin |
| Feb 05 18:25:57 2025 tentative update for new RS41 version, untested | ||
dev20250108-C3 |
Full image | dev20250108-C3-full.bin |
| Jan 08 11:05:17 2025 remove possible startup crash cause | ||
dev20241229-C3 |
Full image | dev20241229-C3-full.bin |
| Jan 01 11:40:27 2025 update push script | ||
dev20241222-C3 |
Full image | dev20241222-C3-full.bin |
| Dec 22 14:25:02 2024 local http updates for development; local http updates for development; update push script | ||
dev20241209-C3 |
Full image | dev20241209-C3-full.bin |
| Dec 10 13:52:08 2024 DNS debug code added | ||
dev20241002-C3 |
Full image | dev20241002-C3-full.bin |
| Oct 03 00:23:26 2024 tentative fix for iOS | ||
dev20240924-C3 |
Full image | dev20240924-C3-full.bin |
| Sep 24 03:55:28 2024 some webserial support | ||
dev20240913-C3 |
Full image | dev20240913-C3-full.bin |
| Sep 14 01:44:42 2024 sh import re-enabeld | ||
dev20240912-C3 |
Full image | dev20240912-C3-full.bin |
| Sep 13 13:28:48 2024 push script enhancements; undo accidental wifi default mode change | ||
dev20240905b-C3 |
Full image | dev20240905b-C3-full.bin |
| Sep 08 16:42:41 2024 wifi, take 2; push script enhancements | ||
dev20240905-C3 |
Full image | dev20240905-C3-full.bin |
| Sep 05 16:36:15 2024 minor wifi reconnect change | ||
dev20240903-C3 |
Full image | dev20240903-C3-full.bin |
| Sep 03 10:20:12 2024 sondehub dfm vs version number workaounrd | ||
dev20240824-C3 |
Full image | dev20240824-C3-full.bin |
| Aug 24 21:31:09 2024 WiFi enhancement: wait for IP address; fix message about space on SD card | ||
dev20240822-C3 |
Full image | dev20240822-C3-full.bin |
| Aug 22 23:52:56 2024 TFT fonts fix | ||
dev20240817-C2 |
Full image | dev20240817-C2-full.bin |
| Aug 18 18:03:05 2024 add V_batt in status, gps fix, pin check in config form | ||
dev20240815-C1 |
Full image | dev20240815-C1-full.bin |
| Aug 16 02:32:23 2024 version update; bugfix | ||
dev20240814-C1 |
Full image | dev20240814-C1-full.bin |
| Aug 16 02:16:25 2024 more status tab refinements; minor bug fixes; minor fixes | ||
dev20240813-C0 |
Full image | dev20240813-C0-full.bin |
| Aug 14 12:19:54 2024 sdcard and about tab refinements | ||
dev20240812-C0 |
Full image | dev20240812-C0-full.bin |
| Aug 13 00:48:22 2024 upgrade to new IDF / arduino version; more refinements; don't send aprs position if disabled in config | ||
Legacy builds
Legacy builds for the old IDF environment. These are end-of-life and no longer updated; please use stable or development builds above for new deployments.
| Version | Type | Download |
|---|---|---|
master_v0.9.5-B17Aug 04 17:23:21 2024 |
Full image | master_v0.9.5-B17-full.bin |
devel20240521-B17May 21 02:09:35 2024 |
Full image | devel20240521-B17-full.bin |