Xhorse VVDI Prog absolutely correct read flash dump on Audi EDC17CP54.
Check wiring connection to EDC17CP54 ECUs:
Audi A6 (C7) EDC17CP54 (TC1793) (2015/2017)
Audi A7 (4G) EDC17CP54 (TC1793) (2014-2017)
Audi Q7 (4M) EDC17CP54 (TC1793) (2015)
FYI:
1) KTM Bench read it not problem
Here’s the Audi Q7 3.0 2016 VAG EDC17CP54 Pinout for Bench read on KTM Bench
worked out without problems with this connection Read write (EEPROM and Flash) and checksum on this VAG EDC17CP54 with newest Forced Update from Audi
2). Ktag read it ok
with GPT cable… your boot pin correct.