Close serial port , stop uploading after x seconds

[preshantram]

Dear,

I am having the issue that sometimes I don't know if I have a new or old bootloader version of the Arduino nano.
When trying to upload a sketch with the wrong bootloader set, it sends 2 bytes and keeps being in that state.
Is there a proper way to stop the upload process if the wrong bootloader has been set, or the device is simply not responding?
In that case I could restart the uploader process with the right bootloader option being set.

When choosing the wrong bootloader version the function ; uploader.UploadSketch() seems to never break, and keeps the serial port alive.