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  4. bmw cas4 write error
PepeSoft
2021-12-02T17:42:57Z
Hello

have difficulties writing new mileage to cas4.
reading ok but when writing hextag gives error : Chipset rejects speficic command - ref 948-
Hextag tries to erase d-flash but it can`t. Anyone have solution to this? cas error.JPG You have insufficient rights to see the content.
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BMWZG
  •  BMWZG
  • 100% (Exalted)
  • Advanced Member
2021-12-03T08:23:48Z
Looks like damaged flash in MCU.
PepeSoft
2021-12-03T08:28:57Z
I have one old original cas from car and one brand new from bmw. Both give same error...
Autohex_II_BMW
2021-12-04T08:23:35Z
Originally Posted by: PepeSoft 

Hello

have difficulties writing new mileage to cas4.
reading ok but when writing hextag gives error : Chipset rejects speficic command - ref 948-
Hextag tries to erase d-flash but it can`t. Anyone have solution to this? cas error.JPG You have insufficient rights to see the content.



hello
try to make CAS CPU hot and try to write again.
Willisodhiambo
2022-01-27T09:09:33Z
Was this ever resolved?
Autohex_II_BMW
2022-01-28T07:12:10Z
Originally Posted by: Willisodhiambo 

Was this ever resolved?



this issue not with device , must be depends on cas , most of the cas working direct, some rare cases give this issue can be solve by the method explained above .
rghelase2001
2022-02-27T19:54:51Z
Originally Posted by: PepeSoft 

I have one old original cas from car and one brand new from bmw. Both give same error...



Did you solve the issue?
Because I had the exact same issue, and tried everything.
Take a look to my thread, see if the there is anything new:

HexProg issue FF FF in DFlash CAS4+  

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  4. bmw cas4 write error