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Bmw E90 Cas3 ISN change
19-11-2025, 16:53 PM, (This post was last modified: 19-11-2025, 17:03 PM by tryingtobebest.)
Post: #1
Bmw E90 Cas3 ISN change
Hi, i have a vehicle with NO original DDE (09 335d), i bought a second hand DDE and with use of Ktag extracted ISN from it! (Can someone confirm that ISN is present at line 200, 280 and 300 in EEPROM when you read a complete back up with Ktag?)

Using an R270 i got eeprom of the Cas3 and its attached here, as my research and understanding go for 99% of people here and on other forums, I need working key read (to get PAGE 3 and IDE), for someone to help me and decrypt Cas ISN. Just like iin this thread - "How to decrypt ISN from CAS3+ dump with а working key", if i would work on on such scenarios i would probably invest in the tool of some sort but im doing this only on personal vehicles, so not common.

So my original thought was to downgrade CAS with manual Winkfp but then i found this thread - "CAS downgrade"
where username (RS) was able to help TS with his ISN change in crypted CAS without working key, so im wondering if someone can help me with identical case?

My tool are very limited and they are R270, Ktag and BMWStandard tools with good understanding of them!


DDE specs are physical hardware number 8517705 software 8588672 (Read 04 Complete Back Up saved Separately)
DDE ISN seems to be " 27 DC 35 66 B1 52 05 9D C5 A1 7B 05 77 5B 50 20" (eeprom included for verification)

   

DDE + CAS Reads.rar
File Type: .rar
Downloaded: 7 times
Size: 10.26 KB

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21-11-2025, 14:34 PM,
Post: #2
RE: Bmw E90 Cas3 ISN change
I don't know if you need this?


Attached Files Thumbnail(s)
   
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21-11-2025, 17:11 PM,
Post: #3
RE: Bmw E90 Cas3 ISN change
(19-11-2025, 16:53 PM)tryingtobebest Wrote:  Hi, i have a vehicle with NO original DDE (09 335d), i bought a second hand DDE and with use of Ktag extracted ISN from it! (Can someone confirm that ISN is present at line 200, 280 and 300 in EEPROM when you read a complete back up with Ktag?)

Using an R270 i got eeprom of the Cas3 and its attached here, as my research and understanding go for 99% of people here and on other forums, I need working key read (to get PAGE 3 and IDE), for someone to help me and decrypt Cas ISN. Just like iin this thread - "How to decrypt ISN from CAS3+ dump with а working key", if i would work on on such scenarios i would probably invest in the tool of some sort but im doing this only on personal vehicles, so not common.

So my original thought was to downgrade CAS with manual Winkfp but then i found this thread - "CAS downgrade"
where username (RS) was able to help TS with his ISN change in crypted CAS without working key, so im wondering if someone can help me with identical case?

My tool are very limited and they are R270, Ktag and BMWStandard tools with good understanding of them!


DDE specs are physical hardware number 8517705 software 8588672 (Read 04 Complete Back Up saved Separately)
DDE ISN seems to be " 27 DC 35 66 B1 52 05 9D C5 A1 7B 05 77 5B 50 20" (eeprom included for verification)

don't touch anything, load this into dde and try.


Attached Files
DDE 8588672 R04 CBU Sprt isn ok.zip
File Type: .zip
Downloaded: 2 times
Size: 9.97 KB


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Reputation: +1 - al70 [+1]
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21-11-2025, 18:59 PM,
Post: #4
RE: Bmw E90 Cas3 ISN change
https://cartechnology.co.uk/showthread.php?tid=112680

Don't PM me for SW keys, FRM, Licences, radio codes or similar, you will not get any answer...
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21-11-2025, 21:19 PM,
Post: #5
RE: Bmw E90 Cas3 ISN change
(21-11-2025, 18:59 PM)sixcode Wrote:  https://cartechnology.co.uk/showthread.php?tid=112680

oh wow... double posting

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