Mounting from ufs:/dev/ufs/pfsense0 failed with error 19

[Snailkhan]

Hi,
i am unable to boot when i write nanobsd image to 16gb thumb drive using either rufus/dd as per the official guide.

however if i write them to a 4gb thumbdrive they work just fine ..

i m using HP x705w 16gb usb3 thumb drive .
erro screenshot is attached.
so far i have formated in windows (both quick/full) and tried writing image as per official instructions but still getting this error.
tried this usb on multiple systems getting same error on all.

[Snailkhan]

After following article i was able to boot pfsense but it wont survive reboot .. it will be at that screen requiring me to input ufs:/dev/da0s1a

http://mundofreebsd.blogspot.com/2012/09/mounting-from-ufsdevadaxs1a-failed-with.html

here is my fstab contents
/dev/ufs/pfsense0 / ufs ro,sync,noatime 1 1
/dev/ufs/cf /cf ufs ro,sync,noatime 1 1

how to set them to make ..
below are pictures after i entered above command .. (ufs:/dev/da0s1a)