Hi,
tried creating several times the rescue disk with latest Avast free on a Win10 x64 v1803 with latest Win Updates installed.
The USB drive is reported then by latest Rufus as:
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1 device found
Disk type: Removable, Disk size: 2GB, Sector size: 512 bytes
Cylinders: 242, Tracks per cylinder: 255, Sectors per track: 63
Partition type: MBR, NB Partitions: 1
Disk ID: 0x5A30F7F9
Drive has a Windows 7 Master Boot Record
Partition 1:
Type: NTFS (0x07)
Size: 1.9 GB (1993274880 bytes)
Start Sector: 132, Boot: Yes
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so it looks fine to me.
Testing it, the drive is seen within my Asus Z87 Max VI Formula F8 boot menu, however when passing control to it i quickly see a blinking shell prompt in top left corner of the black screen, then it immediately skips to my standard system drive boot sequence, booting my Win 10 normally.
How can i check what is the issue?
Thank you