Changing a filesystem UUID to upgrade an Android MicroSD without changing app

On a MicroSD to be replaced by an upgrade/new MicroSD, you plug it into the chip drive, without mounting the filesystem (you can but it isn't necessary), then run "blkid" to find the UUID of the old MicroSD.


On Linux if you connect a MicroUSB, you can run a "mkdosfs" (make DOS filesystem) to format the filesystem with the same UUID of the previous MicroSD.


mkdosfs -i 12345678 /dev/sdh1
**** no dash in the UUID above
or
tune2fs /dev/sdX1 -U 1234-5678