Warning: it's a MM32SPIN27PF. That's a Cortex M0, so it won't be compatible with this CFW.
There isn't a single ksger with a M0 mcu, all use STM32 F1 series (cortex M3).
Porting it would be lot of work for just a single board.
I recommend replacing it with a stm32F103C8 or CB, ex. from here:
https://www.aliexpress.com/item/1005001953737425.htmlMight be a clone, but most work ok. Only CH32F have issues in this FW (ADC reading random values).
The connection problem is a common issue, happens with most controllers because SWD interface is disabled in software, so ST-Link won't be able to access the stm32 unless it's in reset state.
Try connecting RST pin to ST-Link. That's stm32 pin 7 (48 pin package).
It'll be connected to a capacitor, solder a wire there.
Do you want to lower the standby time even more?
1 minute is already very low, it'll enter standby after only 1 minute of inactivity.
Read the operation manual, everything is explained there. If you still have doubts, ask
.