In the notes on this page: [(https://github.com/CrealityOfficial/Creality_Sonic_Pad/blob/4f5b40563217835a1d29659e0316ae0243582a64/printer_configrations/printer-Cr10Smart-CRC-2405V1.2-103-28Kib.cfg)]
The instructions state on lines 7 and 8:
# To use this config, during "make menuconfig" select the STM32F103
# with a "28KiB bootloader" and serial "(on USART1 PA10/PA9)"
This will not install Klipper correctly. Here is the revised version that I propose:
# To use this config, during "make menuconfig" select the STM32F103
# with a "28KiB bootloader" and serial "(on USART1 PA10/PA9)". Select
#"Enable extra low-level configuration options" and enter "PA0" in the
#"GPIO pins to set at micro-controller startup" field.
If you do not set that GPIO pin on making the klipper.bin file, the power relay will not latch.