I suggest you read through the first post (at least) of this topic:
viewtopic.php?t=63227
If your internal MicroSD card has or is starting to fail, then it's probably too late at this stage to think about cloning the complete card, as all you will be doing is cloning the corrupt files. However, if you read through the post, you will see that there is still the possibility that Mirascripts can copy the critical configuration / user files that you need to restore on a new MicroSD card that may prevent it from defaulting to factory values, requiring a dealer visit for reconfiguration.
So I would at least attempt to extract the critical files as per the guidance first. If that is successful, then you should be able to replace the card with a new one, use the latest firmware (2.86) which will recreate all the partitions and operating system, then you can use the Part B of the Mirascript programme to restore the user / vehicle configuration data, which should restore all the factory fitted options and configuration you had.
At this stage I think you have little to lose. Be aware that replacing with a non-OEM head unit will very likely remove access to vehicle menu and configuration settings.