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A proper method of updating NOOBS without formatting the EXT4 partition #19
Whenever I try to update the the existing NOOBS installation from the FAT32 partition from the repository, it automatically formats my existing operating system. Is there some kind of configuration or flag that's triggered to let NOOBS know if there's an existing partition?
NOOBS will automatically reformat the card if "runinstaller" is present in recovery.cmdline and will automatically remove this from recovery.cmdline after the format has occurred (usually on first boot).
If you are replacing the files in the NOOBS fat partition (e.g. to test the dev branch), you should remove "runinstaller" from recovery.cmdline after copying the replacement files. Note that this is obviously non-standard behaviour and is not officially supported.
Does this solve your issue? If so please close the bug.