# New setup mcu buffer Unable to connect **URL:** \ **Category:** Sovol SV08 MAX\ **Tags:** firmware\ **Created:** [June 20, 2026, 10:48am UTC](https://forum.sovol3d.com/t/new-setup-mcu-buffer-unable-to-connect/10132 "2026-06-20T10:48:20Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Jooa](https://avatars.discourse-cdn.com/v4/letter/j/ed655f/32.png) [@Jooa](https://forum.sovol3d.com/u/Jooa)\ **Post date:** [June 20, 2026, 10:48am UTC](https://forum.sovol3d.com/t/new-setup-mcu-buffer-unable-to-connect/10132/1 "2026-06-20T10:48:20Z")
I have purchased a Sovol SV08 MAx. When I start up the printer for the first time I get the following message. mcu buffer\_mcu : Unable to connect. Once the underlying issue is corrected, use Firmware\_restart. Does anyone know how to solve this problem? ---
**Author:** ![mich0111](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/mich0111/32/1176_2.png) [@mich0111](https://forum.sovol3d.com/u/mich0111)\ **Post date:** [June 20, 2026, 10:55am UTC](https://forum.sovol3d.com/t/new-setup-mcu-buffer-unable-to-connect/10132/2 "2026-06-20T10:55:37Z")
Hello, I’m not sure if this issue has been fixed, but there are two discussion threads on this topic on this forum. I recommend that you read them first. After, if it’s not enough, don’t hesitate to repost. BR ---
**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\ **Post date:** [June 20, 2026, 11:31am UTC](https://forum.sovol3d.com/t/new-setup-mcu-buffer-unable-to-connect/10132/3 "2026-06-20T11:31:33Z")
Pull off the toolhead cover & make sure there are no loose wires/plugs. ---
**Author:** ![Jooa](https://avatars.discourse-cdn.com/v4/letter/j/ed655f/32.png) [@Jooa](https://forum.sovol3d.com/u/Jooa)\ **Post date:** [June 20, 2026, 12:14pm UTC](https://forum.sovol3d.com/t/new-setup-mcu-buffer-unable-to-connect/10132/4 "2026-06-20T12:14:54Z")
Problem solved Disconnected cable