# $395 not available to use PWNCNC

**URL:** <https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977>\
**Category:** ❓ Question\
**Created:** [August 25, 2026, 11:34pm UTC](https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977 "2026-08-25T23:34:28Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![sylthecru](https://forum.sienci.com/letter_avatar_proxy/v4/letter/s/34f0e0/32.png) [@sylthecru](https://forum.sienci.com/u/sylthecru)\
**Post date:** [August 25, 2026, 11:34pm UTC](https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977/1 "2026-08-25T23:34:28Z")

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I am trying to configure my PWNCNC which I brought over from my old machine, I have configured the VFD but I am unable to set the parameters needed in gsender which is mainly:

$395 = MODVFD  
$462 = 40960  
$463 = 40961  
$464 = 36864

> **[Sienci Labs - SuperLongBoard(-ext) Controllers (aka AltMill's) - PwnCNC](https://support.pwncnc.com/kb/article/468-sienci-labs-superlongboard-ext-controllers-aka-altmill-s/)**

I only see the following options in gsender 20260318 (1.6.3), any help will be appreciated. I have searched in pwncnc forums without a solution.

 ![image](https://forum.sienci.com/uploads/default/original/2X/9/91cd29355582ad71cdc39c4d33c52f764399f5e1.png)

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**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\
**Post date:** [August 26, 2026, 12:56pm UTC](https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977/2 "2026-08-26T12:56:44Z")

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@sylthecru When you say that you are unable to set those parameters, how have you tried to set them? What happens when you try that?

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<div class="post-metadata">

**Author:** ![sylthecru](https://forum.sienci.com/letter_avatar_proxy/v4/letter/s/34f0e0/32.png) [@sylthecru](https://forum.sienci.com/u/sylthecru)\
**Post date:** [August 26, 2026, 1:11pm UTC](https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977/3 "2026-08-26T13:11:18Z")

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@FranStet I will follow up with the error code when I back home tonight. But off the top of.my head it was the variable is not correct

Per pwncnc documentation $395 = MODVFD which fails

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**Author:** ![KGN](https://forum.sienci.com/letter_avatar_proxy/v4/letter/k/c77e96/32.png) [@KGN](https://forum.sienci.com/u/KGN)\
**Post date:** [August 26, 2026, 1:12pm UTC](https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977/4 "2026-08-26T13:12:23Z")

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Hey,

The first new firmware release for the EXT (20260318) only had 4 spindles compiled in due to a web builder limitation/engineer oversight.

The newer release since then has all of them available.

You’d need to reflash your board with 20260525, which would give you MODVFD as an option.

This is not a gSender issue, its the firmware build you have on there.

Firmware images for the EXT can be found here: [Firmware & Flashing - SuperLongBoard](https://resources.sienci.com/view/slb-firmware-flashing/)

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<div class="post-metadata">

**Author:** ![sylthecru](https://forum.sienci.com/letter_avatar_proxy/v4/letter/s/34f0e0/32.png) [@sylthecru](https://forum.sienci.com/u/sylthecru)\
**Post date:** [August 26, 2026, 10:04pm UTC](https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977/5 "2026-08-26T22:04:33Z")

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@KGN you were right! once I updated the SLB and now my VFD works! thank you again.

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**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\
**Post date:** [August 26, 2026, 11:55pm UTC](https://forum.sienci.com/t/395-not-available-to-use-pwncnc/26977/6 "2026-08-26T23:55:27Z")

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Closed on August 26, 2026, 11:55pm UTC