New map is 17GB so you'll need a 32GB USB or larger.
If you have Windows 10, it won't format the drive as FAT32 which the Landrover updater requires (it will only do exFAT and NTFS, neither of which work).
I used this program to format the stick correctly:
May be because I used a 64GB stick - "Windows 10 Disk Management tool only supports formatting a USB drive or hard drive which is smaller than 32GB to FAT32"
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