[DomiK]

Hello Guys,
My Car received an iStep upgrade to 26-03-550. Since then the Kafas stopped working as well as the navigation.
The HU boots and shows navigation for a couple of seconds till it stops. Sometimes SLI works but most of the time not.

I tried clearing DTCs, resetting the ecus, recode and f5с repair kit.

VIN: WBA3Y31010DZ26239
DTC Count: 3

/// KAFAS2 [5D] - Camera-based driver assist system ///
E07C0A -> Message (navigation system information, 0x34E) missing, receiver KAFAS, transmitter HU/ZGM
E07C13 -> No message (navigation graph concordance, 0x348), receiver camera-based driver support system, transmitter HU / ZGM

/// KOMBI [60] - Instrument panel control unit ///
E12C20 -> KAFAS interface (traffic sign identification, 0x287): Signal invalid

I dont know what to do anymore.I wanted to downgrade the Software of the Kafas but I didnt have any luck finding older Р5dZDата which worked with ё5у5 ultra.
Car had the original FA when flashed. No fake f5сs except a lifetime code for the map, which was bought on ebay.
If navigation boots, it will show wrong location in the beginning.
Does anyone have a similar experience or maybe a solution?

[sqorpius]

KAFAS2 depends on HU to work properly. Its fusion, so it relies on NBT HDD MAP data, but also scans active road signs etc. Your problem is within the HU.

Does the HU reboot? Or does the navigation gets greyed out. Check f5с status in ё5у5 in HU. Perhaps HU was ратснёd before and current f5с's are rejected. Do you still have voice commands?

Try to update the MAP data first if the HU itself does not reboot, IF f5с's are still accepted.

[Fx82]

and if you have no knowledge of ё_5у5 check with i5тд.

[pcp1234]

if hu is rebooting, its simple

[atomantmk]

ратснёd with fake f5с and after update it's normal not to work!