BMW E70 cyclic authentication error after tune

[nickolasd]

I'm trying to solve this problem with E70 with edc17cp09 ecu

after tune getting checksum errors:
41FD and 41ED - DDE control module internal(cyclic authentication)
checksum corrected by Ktag original during write, same problem
than manually corrected checksum with Winols with help of member here, same problem.

ori, mod and mod with checksum files attached.

[dominik.m]

Hi.
Subject bmw with these DTC was many time on this forum.

[nickolasd]

well may be i dont know how to search but when use key word "cyclic authentication" i get only 2 of my own posts from entire forum. when i search by dtc code 41fd or 41ed i get same results. and when i use "control module internal" i get million hits for any other make on model but not for bmw. so even if it was already discussed many times on forum it makes it quite difficult to find.

[Ignasvw]

Maybe just delete dtc and problem solved?

[nickolasd]

yes may be, but problem somewhere in a checksum and I'm looking for solution how to fix that checksum or maybe dump is bad

[aem]

you will not solve this problem without update ecu
so better delete error and goodbye......it will work forever