ESP32 hangs when booting without wifi (Blynk.begin ();)

With what? This OP’s particular issue… who knows :stuck_out_tongue_winking_eye:

Or with the overall solution? Which was already answered in the link above… but here it is again…

Just switch to Blynk.config() and additional connection management as needed

Here is an example for such, just adjust the libraries for ESP32

If you have any further questions, please create your own topic with full details, Thank you.