Proxy Alignment failed after enabling CarPlay – BCM inaccessible, flashing dashboard, car won't start

[santosweb]

Hi everyone,

I have a 2017 Fiat Tipo, and I attempted to enable CarPlay by modifying a few configuration bits in Proxy Aligment using Multiecuscan — no hardware changes, no module replacements.

During the process, the Proxy Alignment failed midway, and since then the car has developed the following issues:

Dashboard is flashing non-stop;

I hear clicking/relay noises when turning the ignition on;

The engine won’t start at all;

I can no longer access the BCM via Multiecuscan (connection fails or times out).

I used a USB ELM327 with FTDI chip and the blue adapter for MS-CAN. Battery was fully charged during the procedure.

Now I’m trying to understand:

Is this a recoverable configuration issue I can fix myself by reverting the bits or forcing a new Proxy Alignment? (I backed up the original bits to a notepad before modifying anything)

Or do I need to take it to a shop with a professional diagnostic tool (like Autel or WiTECH) to reset the Proxi configuration or reprogram the BCM?

My main concern:
Is this likely just a software/configuration conflict, or could the BCM or another module be physically damaged?

Any advice or insight would be greatly appreciated!

Thanks in advance.

[shpuncik]

reset BCM by disconnecting battery negative terminal for couple minutes. this should allow connection to BCM.
also you can check FESLog file what exactly was changed.