Here is a customer solution of PCR2.1 unlock with MPPS v18 ecu tuning tool china clone version.
Note: you will try on your own risk.
Here’s the pinout for this, i found how to do a few months ago
the second pin at the bottom left is kline green wire with mpps v18
now this is how you boot ecu without resistors.. but you might want to try resistors
writing eeprom here after unlock
tested with kess v2 too
in mpps v220.127.116.11 software, locked/unlock
Ecu status: locked
Ecu status: unlocked
worded better with 15v tho , but that might be the clone
now turn off power leave pinouts on remove boot pins and read and write on bench on obd , its a fast way to do this ecu , just tested and unlocked and locked the same ecu 10+ times with no problems , think l will use this on the next one l get in.