Tolino Vision 6 Internal Storage Replacement or Upgrade

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increasing the partition size: preperation

The first step is to increase the size of the main data-partition to fill out the empty space at the end of the partition table.
Luckily the partition in question is at the end of the table.
Don't make the mistake I made and use GParted for this. It will break your system and you have to write the SD image again.
If you haven't installed them on your system, install f2fs-tools version >= 1.15 and gdisk.
f2fs-tools 1.14 (and maybe older versions as well) will throw some wrongful error messages depending on the size of the SD card.
Some/Most/All commands in this guide need to be run with superuser rights.

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