If you still have a valid update subscription than do the following insert SD Card 16gb or, 32gb make sure its San-disk delete Benz and BMW software and restart your tablet than first install Benz software than BMW which will be installed in your SD Card automatically relax and seat back as the BMW software is very big................
https://www.ebay.co.uk/itm/New-SanDisk-Class-10-Ultra-16GB-98MB-s-Micro-SD-SDHC-Memory-Card-UHS-I-with-adap/263335096564?epid=8011040338&_trkparms=ispr%3D1&hash=item3d4ffeb0f4:g:3T4AAOSw0W5aExu3&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qXCfsognIednp9f6K5JxT2YelFrfGlNOPs35HRsM4OxMA1F26NV0dX1ANjPw5cvOPAYZzQtpav%2BBnkEcx4opy8%2Fhb0DBHgTCZ5IGRGK49HZPHP0L1%2FbB8eotqXRZojx1yPv%2FzRkYqFbrxFKKXEyKYK0r7B5IpNJLzjKmFIVw4Y5yy7TyGurZuAucB8IdG%2F0V9GLwjk%2B9PMSDjGqIECUBye4K3glBXyDFk2IaSLrZ7OuqSkBehGfIo%2FWrPC1vHol0jnGAGJ%2FnVP%2FGSXfLgPw1odCXSyzkru0EdWPBlt%2BLdlPLmTIliI7RTyC80ZuHRZ3AzaOn7Fdc7T8pTwvETH5%2BBxRCdZe763DX5C80MJkHLz6UguOxMWVcQr2si%2Fyi9S7nqW%2BUm%2B1CrpTi0e0IAsSp%2FMxnjDOBZz7XH0JDe2cK9Y6GXc9UX3tpsZYVnPODFgw9ymlOL45hwP3Qo%2BAyMjQSeJ%2B7HV3tjRgGAlka97pomGoI%2Bm6qyKYbif0QT4A1Nj1lEFU0RccbuodNkHc3Jb16lq9xbihKNq5R9%2Bt7EiYnQpkQqgqsht%2F9sUkJ71wXH0RbNi4h%2F1wXVrOCuth61viLuRVr3Ja%2FoBS4WTKqSjKXnMmu2VNQX8dxHCmrFnm5oumGSES9VIPlgb8AjqHBXxXm4dK6LdCNXWWgle0YQEh6%2BuxaHB7yQ9pyGxqlwf3egjyaSnsTb%2BExYHvEPxiuFCpdnr%2FkLPaiB58mja%2B7aGWpq%2F7jw%3D%3D&checksum=263335096564f94d1aea5dee469b91e320cc1b443ad0&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qXCfsognIednp9f6K5JxT2YelFrfGlNOPs35HRsM4OxMA1F26NV0dX1ANjPw5cvOPAYZzQtpav%2BBnkEcx4opy8%2Fhb0DBHgTCZ5IGRGK49HZPHP0L1%2FbB8eotqXRZojx1yPv%2FzRkYqFbrxFKKXEyKYK0r7B5IpNJLzjKmFIVw4Y5yy7TyGurZuAucB8IdG%2F0V9GLwjk%2B9PMSDjGqIECUBye4K3glBXyDFk2IaSLrZ7OuqSkBehGfIo%2FWrPC1vHol0jnGAGJ%2FnVP%2FGSXfLgPw1odCXSyzkru0EdWPBlt%2BLdlPLmTIliI7RTyC80ZuHRZ3AzaOn7Fdc7T8pTwvETH5%2BBxRCdZe763DX5C80MJkHLz6UguOxMWVcQr2si%2Fyi9S7nqW%2BUm%2B1CrpTi0e0IAsSp%2FMxnjDOBZz7XH0JDe2cK9Y6GXc9UX3tpsZYVnPODFgw9ymlOL45hwP3Qo%2BAyMjQSeJ%2B7HV3tjRgGAlka97pomGoI%2Bm6qyKYbif0QT4A1Nj1lEFU0RccbuodNkHc3Jb16lq9xbihKNq5R9%2Bt7EiYnQpkQqgqsht%2F9sUkJ71wXH0RbNi4h%2F1wXVrOCuth61viLuRVr3Ja%2FoBS4WTKqSjKXnMmu2VNQX8dxHCmrFnm5oumGSES9VIPlgb8AjqHBXxXm4dK6LdCNXWWgle0YQEh6%2BuxaHB7yQ9pyGxqlwf3egjyaSnsTb%2BExYHvEPxiuFCpdnr%2FkLPaiB58mja%2B7aGWpq%2F7jw%3D%3D&checksum=263335096564f94d1aea5dee469b91e320cc1b443ad0