Gsnrw @ 07/03/19, 18:52
... it will not be removed all this when reset to the factory?
In this case, of course retire.
When reset, the internal memory is formatted, and the bare system is installed from ROM. If you really need to save a backup copy in the built-in memory (for example, there is no SD card), copy it to a PC before resetting it and return it back after resetting it.
Something like this ...