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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Rescue Disc => Topic started by: REDACTED on August 14, 2018, 10:05:24 AM

Title: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: REDACTED on August 14, 2018, 10:05:24 AM

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:
---
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
---
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

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: REDACTED on August 28, 2018, 01:17:05 PM

Anyone has suggestions? Thx

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: Asyn on August 29, 2018, 05:02:40 AM

Update to the latest version (18.6.2349): https://forum.avast.com/index.php?topic=221320.0

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: REDACTED on August 29, 2018, 11:18:18 AM

Still no luck/change, seen at boot as UEFI boot drive but bypassed immediately for std SSD boot sequence. New Rescue disk data:
Rufus version: 3.1.1320
Windows version: Windows 10 64-bit (Build 17134)
Syslinux versions: 4.07/2013-07-25, 6.03/2014-10-06
Grub versions: 0.4.6a, 2.02
Localization set to 'en-US'
Found USB 2.0 device 'Generic Flash Disk USB Device' (1908:1320)
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

Thx

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: REDACTED on August 29, 2018, 11:19:16 AM

Are any special settings in BIOS needed to boot successfully with UEFI Asus mobos and W10 x64? Things like Secure Boot, CSR on/off, etc.

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: REDACTED on September 02, 2018, 11:28:33 AM

Any further ideas? Thx

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: Asyn on September 02, 2018, 11:39:42 AM

Unfortunately, there's no additional support for Avast Free.
But you can submit a bug report in "About Avast".

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: REDACTED on September 02, 2018, 11:56:08 AM

I understand, thx, doing now

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: REDACTED on September 02, 2018, 01:04:11 PM

Solved.

Issue is the Compatibility Support Module (CSM) BIOS setting, which must be enabled, and the Boot Device Control setting under it, which must be set to UEFI and legacy.
It seems Avast Rescue Disk is a Win 7 MBR-partitioned disk formatted with NTFS, it actually has EFI files but it does not have the file /efi/boot/bootx64.efi, only bootia32.efi is there. I believe it fails since my OS is 64bit.

Regs

Title: Re: Rescue disk does not boot even if seen in mobo F8 boot menu
Post by: Asyn on September 02, 2018, 01:24:28 PM

Thanks for the feedback.