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In A5D2x board is boot through nor in which pyserial package is not available due to size issue. So you can boot from sdcard in which pyserial package is available .
So please follow the below link to download the images
Can you please post your code and the error details
https://developer.ruggedboard.com/g1-getting-started/example-program-for-interfaces-using-python-3
taken code from here
In A5D2x board is boot through nor in which pyserial package is not available due to size issue. So you can boot from sdcard in which pyserial package is available .
So please follow the below link to download the images
https://www.dropbox.com/s/rrjy98hvp7zwolt/pyserial.tar.gz?dl=0
https://developer.ruggedboard.com/g1-getting-started/example-program-for-interfaces-using-python-3 I taken code from here only