CAS3+ ista45 need ISN

**drugowaz** · 14th November, 2018, 04:12 PM

Where he shows isn uncrypted?

**sniegavirs** · 14th November, 2018, 06:04 PM

Originally Posted by ray-ray

If you have a donor cas3 with a working with very low miles, plug it in. Use the start button,now the ecu will give isn uncrypted. You know what to do from here on. A working Cas with know key is the gateway to the isn.

Sorry but i did not understand anything...

**droidwayne65** · 14th November, 2018, 10:04 PM

Originally Posted by pepi

Hello
I need ISN from CAS3+ with ista45 so I can make new key because of all keys lost .
I think CAS is on boot mode too somebody check if for me please.
Dump of ECU BOSCH 0281 015 852 uploaded

A dump of the ecu would end all the debate in this thread and also help resolve your problem.

**rivalryan** · 15th November, 2018, 12:27 AM

Originally Posted by pepi

You are absolutely right , this is very strange situation on this CAS. I know one more think now - that some one worked on it before I do and it is possible they could update CAS so I am heaving problems now to make new key.
I have downgraded CAS with AVDI online but it still ask for 16bit ISN from DDE.
I try to make transponder 7936 with tag tool so I can wake up system but still does not accept the key.
And my only problem is that I have only CAS and ECU , car is far away from me.

Sent from my SM-G925F using Tapatalk

It is straight forward to connect to DME on bench with AVDI and read ISN just need 120ohm resistor on CAN and connect direct to read. Do you need pinout?
Also when writing 7936 there is a specific procedure to add even after preparing chip.

**ray-ray** · 15th November, 2018, 05:03 AM

Without a know key dme info via obd2 will be crypted... on all Cas having + or ++
cas4 is not crypted. So if you have a donor cas3+ with a know key and miles are set to low. You can use that to see all your info off the dme will be decrypted (isn,crypt key, secret key) .. witch back to your original cas3+
you have the dme info. To input into your Cas (good 16 bit decrypt isn #)

**rivalryan** · 15th November, 2018, 09:32 AM

Yes you can do like that or you can write a temporary pcf7936 to CAS for ignition on and do the same without replacing anything, If working in the car (via OBD). IF you have DME on the bench it is not needed to do that way of course, connect with AVDI (cloud) and extract ISN no problem, then add key to cas on bench

**pepi** · 15th November, 2018, 07:28 PM

SOLVED , the eeprom and flash dump was corrupted .I have downgraded CAS and after that AVDI has shown CAS not crypted .
So , this CAS was not ISTA 45 + but it was damaged .
Raimi.s your file was ok with just little bug needed to repair , thank you.
Thank you all for input.

**droidwayne65** · 15th November, 2018, 11:44 PM

Originally Posted by pepi

SOLVED , the eeprom and flash dump was corrupted .I have downgraded CAS and after that AVDI has shown CAS not crypted .
So , this CAS was not ISTA 45 + but it was damaged .
Raimi.s your file was ok with just little bug needed to repair , thank you.
Thank you all for input.

Heheh, good job. Could see nothing in it that indicated it was anything but CAS2+/3.