I,m thinking of upgrading my Pi-Os and I do not know for sure if Bulleseye is fully trustable and might have a glitch on me. Does it have aney problems, can I trust it, or is it dangerous or hard to install?
Thank's for your time.
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You are right, it is never a good idea to deploy a newly released OS into a production environment without thorough testing first. Fortunately, the Raspberry Pi itself is primarily a test environment anyway.
One thing you could try is to simply power down your Pi, remove the SD card, mount another, newly flashed SD card with Bullseye on it, then mount your old SD card in a card reader via the Pi's USB port. This way you can boot the Pi from Bullseye, and still have access to your data. If you encounter any issues with the rollout, simply swap the SD cards back over, and resume booting from your former OS installation.