# Clarify firmware/sienciHAL **URL:** \ **Category:** ❓Question\ **Created:** [May 5, 2026, 3:34pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345 "2026-05-05T15:34:25Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![DavidB](https://forum.sienci.com/letter_avatar_proxy/v4/letter/d/76d3ee/32.png) [@DavidB](https://forum.sienci.com/u/DavidB)\ **Post date:** [May 5, 2026, 3:34pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345/1 "2026-05-05T15:34:25Z")
Can someone clarify if sienci is now using the official grblHAL firmware for the SLB and SLB-EXT now and not a fork? I see the GitHub repo for sienciHAL says it is no longer maintained. Does that mean someone can use [https://svn.io-engineering.com:8443/index2.html](https://svn.io-engineering.com:8443/index2.html) to generate their own firmware if we selected the correct options and it be the equivalent to what sienciHAL now includes with the SLB and SLB-EXT? ---
**Author:** ![Chucky\_ott](https://forum.sienci.com/user_avatar/forum.sienci.com/chucky_ott/32/8692_2.png) [@Chucky\_ott](https://forum.sienci.com/u/Chucky_ott)\ **Post date:** [May 5, 2026, 3:42pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345/2 "2026-05-05T15:42:01Z")
@DavidB I believe that is the case. You can flash your board with the new firmware as per instructions in the ATC documentation. You shouldn’t need to download it from the link you provided. > **[Firmware & Flashing - SuperLongBoard](https://resources.sienci.com/view/slb-firmware-flashing/)** > > Page Suggestions? Check Firmware Version Your board will likely ship with the latest firmware already installed, but we occasionally make updates to add new features or address any discovered issues. You may also choose to re-flash the firmware onto... ---
**Author:** ![DavidB](https://forum.sienci.com/letter_avatar_proxy/v4/letter/d/76d3ee/32.png) [@DavidB](https://forum.sienci.com/u/DavidB)\ **Post date:** [May 5, 2026, 6:09pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345/3 "2026-05-05T18:09:29Z")
@Chucky_ott Thanks! It would be nice if I could generate my own version for peace of mind and in case I need any firmware changes. I was planning on getting the solo RapidChanger “ATC”. It would be super useful if Sienci provided the JSON settings for the firmware they use that the grblHAL builder uses to build one. Since they have other things open sourced perhaps those files used to generate the firmware they are distributing is located somewhere? ---
**Author:** ![DavidB](https://forum.sienci.com/letter_avatar_proxy/v4/letter/d/76d3ee/32.png) [@DavidB](https://forum.sienci.com/u/DavidB)\ **Post date:** [May 5, 2026, 6:41pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345/4 "2026-05-05T18:41:07Z")
Oh it looks like I found it 🙂 > ---
**Author:** ![KGN](https://forum.sienci.com/letter_avatar_proxy/v4/letter/k/c77e96/32.png) [@KGN](https://forum.sienci.com/u/KGN)\ **Post date:** [May 5, 2026, 7:31pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345/5 "2026-05-05T19:31:57Z")
Specifically this configuration requires the dev version of the web builder that supports different machine profiles by vendor, which you can find here: [https://svn.io-engineering.com:8443/index2.html?dev=1](https://svn.io-engineering.com:8443/index2.html?dev=1) ---
**Author:** ![\_Michael](https://forum.sienci.com/user_avatar/forum.sienci.com/_michael/32/2962_2.png) [@\_Michael](https://forum.sienci.com/u/_Michael)\ **Post date:** [May 5, 2026, 10:44pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345/6 "2026-05-05T22:44:10Z")
I have firmware that I build using the dev version of the web builder. I found the link through [Peter van der Walt](https://github.com/petervanderwalt) on GitHub. That was after finding the config for the LongMill on Sienci’s GitHub and it failing to upload to the regular web builder. I just didn’t quite have the confidence to flash it. I think this thread has changed that! EDIT: I flashed it and after swapping some axis directions all seems good! I have a LM Mk1 so some things are different compared to the Mk2 profile. ---
**Author:** ![MrExo3D](https://forum.sienci.com/user_avatar/forum.sienci.com/mrexo3d/32/9483_2.png) [@MrExo3D](https://forum.sienci.com/u/MrExo3D)\ **Post date:** [May 14, 2026, 5:46pm UTC](https://forum.sienci.com/t/clarify-firmware-siencihal/26345/7 "2026-05-14T17:46:52Z")
This page links to hex firmware files > **[Firmware & Flashing - SuperLongBoard](https://resources.sienci.com/view/slb-firmware-flashing/)** > > Page Suggestions? Check Firmware Version Your board will likely ship with the latest firmware already installed, but we occasionally make updates to add new features or address any discovered issues. You may also choose to re-flash the firmware onto...