I am not a fan of the "direct from china" sites. Are there any affordable BDM tools?
IMHO it's better to start experiments with MED9 ECU using BDM.
First step make a "photocopy" of original ECU content (Flash/EEPROM/CPU)
Than you can always and anytime 100% recover your ECU to virgin state after any unsuccessfully test und never lost it as "brick".
BDM-100 clones "made in China" are good reliable and affordable.