01-23-2020, 01:08 PM
Your best/easiest/fastest method would utilize the emmc reader if you have one. Use if to make a backup of the emmc on another computer, then write the contents of your SD to the eMMC and finally write Debian to the SD.
If you don't have the adapter, you can do it using a ext or thumb drive, a USB SD adapter/reader, and another SD running a Linux. Using the second Linux SD, make backups of the emmc and SD onto the ext/thumb drive. Then write each image to its new media. You shouldn't (and may not be able to) do this from within one of your installs.
If you don't have the adapter, you can do it using a ext or thumb drive, a USB SD adapter/reader, and another SD running a Linux. Using the second Linux SD, make backups of the emmc and SD onto the ext/thumb drive. Then write each image to its new media. You shouldn't (and may not be able to) do this from within one of your installs.