# Error mcu buffer\_mcu: Unable to connect
**URL:** https://forum.sovol3d.com/t/error-mcu-buffer-mcu-unable-to-connect/8497
**Category:** Sovol SV08 MAX
**Tags:** firmware, advice
**Created:** [August 10, 2025, 1:58pm UTC](https://forum.sovol3d.com/t/error-mcu-buffer-mcu-unable-to-connect/8497 "2025-08-10T13:58:47Z")
**Posts on this page:** 4
**Page:** 2
### Author:  [@AlwinA](https://forum.sovol3d.com/u/AlwinA)
#### Post date: [August 19, 2025, 9:20pm UTC](https://forum.sovol3d.com/t/error-mcu-buffer-mcu-unable-to-connect/8497/21 "2025-08-19T21:20:30Z")
@cardoc: i didn’t get to test the sv08 macros.cfg - i found the problem instead. the green cable of the can-bus cable from the mainboard to the aux buffer feeder was crimped so badly it slipped just out while checing the wiring again. the plugs are micofit 3.0 mm 4 pin - wich i do not have around, and i found no way to get the pins out of the plug to solder the wire back on ☹ i ordered some plugs and cable at ali, and wait for the replacement cable from sovol to arrive.
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### Author:  [@Lion](https://forum.sovol3d.com/u/Lion)
#### Post date: [August 19, 2025, 11:20pm UTC](https://forum.sovol3d.com/t/error-mcu-buffer-mcu-unable-to-connect/8497/22 "2025-08-19T23:20:57Z")
Can you email @sovol3d about this with pics please.
[info@sovol3d.com](mailto:info@sovol3d.com)
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### Author:  [@AlwinA](https://forum.sovol3d.com/u/AlwinA)
#### Post date: [August 20, 2025, 12:07am UTC](https://forum.sovol3d.com/t/error-mcu-buffer-mcu-unable-to-connect/8497/23 "2025-08-20T00:07:08Z")
hello. yes of course - and i did over a week ago, your ref. no. is PBID007941122
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### Author:  [@AlwinA](https://forum.sovol3d.com/u/AlwinA)
#### Post date: [August 23, 2025, 5:41pm UTC](https://forum.sovol3d.com/t/error-mcu-buffer-mcu-unable-to-connect/8497/24 "2025-08-23T17:41:09Z")
Hello, after receiving the replacement cable the problem is solved 🙂 thank you Lion, thank you cardoc 👍
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