> I mean how to upgrade the bootable image on the FSF membership card Sorry, I should have read more carefully. I wasn't familiar with the membership card until now, but it appears to be a regular USB drive in the shape of a credit card. You should be able to install Trisquel 8 on it the same way[1] you would any other USB drive.
[1] https://trisquel.info/en/wiki/how-create-liveusb
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