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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
"ERROR: Prompt not detected - upload failed. Trying to recover..." is an indicator for the case where something is already started before the upload has finished.
This cannot be all code there is, because you are talking "Not connected to the internet"...
In case of autoconnect - based on saved connection profile / credentials - you should catch the on-connect event and then start your application.
Where the difference comes between the versions, I don't know. I also do not know where the print goes and how it is configured... It may be held back. See comments about console and console redirection...