MAC address is no more used to identify & assign station number and linking to account.
A “Unique Identifier” is now used.
Every time a new image is written, Flightaware assigns a new “Unique Identifier”, and a new station number.
If you want to retain old station number, go to this page:
Bake a Pi, Option-1
Go to , Item 5 (c) “For retaining existing station number and it’s stats” and follow instructions.