Bootcamp disk not bootable
I was trying to non-destructively expand my bootcamp partition. I began by shrinking my macOS partition using Disk Utility. This automatically created a partition in the remaining space called "Untitled."
When I rebooted after that (holding Option), the Bootcamp partition no longer appears as it used to. I tried resetting NVRAM, which resulted in no change.
In Disk Utility, when I select "get info" on the Bootcamp partition, under "Bootable" it says "no." I have also since deleted the Untitled partition and given the space back to my macOS partition.
How can I boot back into Windows? Continue trying to expand the partition? Please help.
MacBook Pro 13", macOS 10.14