[tecas]

Hi All,

I have a Golf MK6 1.6TDI, engine CAYC which had the dieselgate software fix installed before I got it.  The software version is 9982 and I am looking to install 9971.  I understand that ECU is PCR 2.1 and I will need to unlock the ECU before installing 9971 with the appropriate FRF file.  I am trying to figure out if this can all be done with ODIS-E Offline ?  If it can't, what would be recommended to complete this job as a DIY project?  

Thanks!

[gezame]

Hi
If you write the correct frf file, dont need unlock ECU.
Only write with the correct interfaces, odis-E, vagcan pro,
X17, etc

[tecas]

Hi
If you write the correct frf file, dont need unlock ECU.
Only write with the correct interfaces, odis-E, vagcan pro,
X17, etc

Hi and thanks for the reply.  May I ask in what circumstance I would need to unlock then?  I heard the software fix files made it more difficult to roll back because they were locked and needed unlocking first.  It would be great if I simply got a cable and Odis-E offline and flash an older software version using an appropriate FRF file.  It can't be that simple can it?  If it is I may give it a go after I have made a backup of my present ECU.  Thanks.

[busaman]

you only need to unlock it if you want to read via obd but to do that you will have to take the ecu out of the car and k-tag it on the bench unlock it and reinstall,

or as gezame says just writhe the correct file with the correct tool

[tecas]

you only need to unlock it if you want to read via obd but to do that you will have to take the ecu out of the car and k-tag it on the bench unlock it and reinstall,

or as gezame says just writhe the correct file with the correct tool

Hi and thanks for the reply.  So now I will look into getting a valid 9971 FRF file for my ECU  03L 907 425 C.  Then as I understand you both mention, I can do a straight firmware overwrite from 9982 using ODIS-E and not have to unlock first.  If I am wrong about that, please do let me know.  

Still unsure on what the unlock does, I understand it will allow read via obd but doesn't ODIS-E offline need to read before it writes the new FRF file anyway?

Any other tips would be appreciated as I am still learning the basics.  Thanks.