Suite SV06 BLTouch… 
At the risk of sounding stupid, I replaced the PEI with a glass bed and therefore installed a BLTouch.
As I can’t find firmware with BLTouch, I try to compile one, but it’s impossible with SOVOL source code. so I downloaded MARLIN Marlin-2.1.x and modified “Configuration.h” and “Configuration_adv.h” accordingly.
Since then the compilation has failed:
Marlin\src\inc\Warnings.cpp:770:4: warning: #warning “Maple build environments are deprecated. Please use a non-Maple build environment. Report issues to the Marlin Firmware Project.” [-Wcpp]
#warning “Maple build environments are outdated. Please use a non-Maple build environment. Report issues to the Marlin Firmware Project.”
^~~~~~~
Marlin\src\inc\Warnings.cpp:784:4: warning: #warning “GD32-based controllers may not be fully compatible with Maple Generic STM32F103RE. Please report any issues.” [-Wcpp]
Already that I did not like this printer too much, there I am tearing my hair out…