YHamud

I only managed to connect by setting Serial Port 0 -1 in configuration.h.

> do You can share Your configuration.h file please? If you mean me, yes, for sure. It's attached. [Configuration.zip](https://github.com/makerbase-mks/MKS-Robin-Nano-V3.X/files/14133519/Configuration.zip)

Set Serial Port 0 with -1.

I'm facing the same problem with PC14 (fan0) on the TT SP5-V3, will try with PB1 (fan1). The main problem is that the printer used 2 high rpm part cooling...

Hear me out, I found a way around it. Just make the Fan1 pin your Fan0. Go to the pins file (pins_MKS_ROBIN NANO_V3_common.h) and replace PC14 by PB1 on FAN0_PIN...