Help Needed, CLS W218 2015 Dash

[Barry1]

Hi I have a Mercedes CLS w218 2015 that came into workshop with what looked like a faulty dash.
Found can blocker to back of cluster which was faulty , removed from dash works ok now , mileage showed 453079m

On starting the vehicle on a next morning battery was flat and all mileage jumped had changed to 1609343=99999km
I have read with avdi looks like same mileage also in ezs , can mileage have been corrupted by flat battery, never seen this type of fault before.
trying to use avdi to change ..keeps saying " Security Access Failed
I tried to read cgw flash and eeprom that fails too.
Is it possible to open ezs and change mileage on bench maybe then cluster will be ok too.
Any advice really helpful for those who have done this before, Thanks

[momogsm]

Hi

If It FBS3 You Can Change Mileage In Dash You Will Find Eeprom 95640 ( Mileage Is Stored In The First Two Lines ) Then Renew EIS To Have 0 Km In EIS,

But If FBS4 Can Use The Same Can Blocker That You Find In Dashboard, Change Mileage In It And Plug Can Filter, That The Solution,

Good Luck

[Barry1]

Hi ok so just find out its FSB4, and thats not covered by AVDI tool function , maybe thats why when i try and use the instrument odometer calibration function its says security Access Failed.
OK so Hi does anyone know how to change mileage on this type of cluster on bench
Mercedes FSB4
A 218 900 77 03
A2C91367600

I have had look at the chips on pcb but not sure ? anyone done this type before, Thanks