I haven't experienced this because I have the original stereo, but I can offer up some general advice.

First, as you've experienced, the change in stereo from factory to aftermarket has caused the flashing odometer.

* Flashing Odometer = Car needs a Proxy Alignment w/ Alfa OBD or MES (MultiECUscan).

* Proxy Alignments are recommended to ONLY be carried out over a CABLED connection to the PC or MAC.

The reason for this is because the last thing you want to occur during a Proxy Alignment is to have a "disconnect" of Wi-Fi or Bluetooth connection which would quite possibly "brick" your ECU (Vehicle Computer) due a incomplete configuration.

Hope that helps and close the loop by continuing this thread, that way others can learn from your experience.

Photos are also suggested as they are worth 1,000 words and who doesn't like pics?!

 

Thank you very much for the info! I will be getting the necessary equipment this week and hopefully that solves the issue.

 

Maybe I just got lucky (5 times?) doing mine with Bluetooth, but it DID perform 4 incomplete configurations & still ended up working fine . It had to do 5 different configurations, & for each one it would finish & then show only "..." at the end of the next one, without "completed". So each time I just re-started the alignment & it would finish the next configuration but not the one after, until after 5 alignments it finally finished:

I'm pretty sure at least one or two others have reported successful proxy alignments using Bluetooth, but it still seems wiser to use a cable, just in case.

 

I was able to do the proxy alignment today with the OBD MX+ with Yellow Adaptor and AlfaOBD and it fixed the flashing odometer!

I am so relieved. This is a really great investment for our cars. Thank you @Electric Tire Shredder and @fast_dave