Asus Tuf pro z390

Does anyone know of a tutorial to change the Legacy to UEFI for this mother board or one similar to it?

It's hard to find.

Hi Peter. Long time no see/hear

What is the make and model number of the motherboard?

Hi Rich - back at you

AsusTek Computer inc = baseboard manufacturer

Baseboard product - Tuf z390- Plus Gaming(WiFi)

Baseboard version Rev. X.0x

If I left well enough alone I would be wise as all is well except for the few sacrifices re security etc..

I always wanted to know my machine and be able to make changes.

I thought one could change from Legacy to UEFI and reverse in the BIOS - tap F2. I have been there to boot like the old BIOS.

However, I am reading about changing MBR to GPT? the new boot manager - maybe there are two ways to do this change but I would prefer not to get involved with partitions and just go from legacy to UEFI in the BIOS if it was not too hard. Unlike the OS where Macrium saved the day many times I could really have an  non bootable system if I made an error. if I click default it may go to UEFI not legacy as it is set by the builder.

Non of the tutorials really show how too do this the easiest way.

Unless I really am sure I will leave it as is.

I thought it was basically no partitioning but just disabling legacy + disabling CSM and enabling UEFI. Then the reverse to go from UEFI to legacy.

I was not sure about boot. This board has so many features it makes one dizzy.

Read through this tutorial, see if it helps:

Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

Thank you for the tutorial, Rich.

I will study it and good to hear from the Space Center.

Just curious, - system information says Bios mode UEFI and secure boot = off.

Seems like a contradiction.

I don't want to cause a problem so made no changes but looking in the BIOS I see;

 Boot manager = Samsung SSD 860 EVO  500 GB – that seems OK   

Build 9-21-18    I talked with him about building this rig around January 2019 so could this be the build date of the board or was the PC built in that date of the 21^st of Sept. It has exactly what we talked about as far as features go so either he modified an older PC or this was built then and sat on the shelf.

Without expert instruction I don’t dare to modify/inspect anything or I could end up with an non bootable ‘thing’.

I have watched videos as to how to go from legacy to UEFI and back to Legacy.

I right clicked my disc zero then properties and under volume saw GUID Table - GPT.

I am wondering if I am in UEFI but with secure boot disabled and also in legacy to facilitate booting with pen drives.

My last observation is that I reported to the builder that there was an intermittent very soft ticking sound and he said SSD’s don’t make noise and it is likely a fan and to disregard it. Most of the time it is very quiet.

Can anyone comment on what they read?

Secure Boot just limits what your computer will boot. It's part of UEFI. If it's on then you won't be able to boot a CD, DVD, Flash drive, only trusted OS boot loaders. Safer but hard to use when debugging problems.

Thanks,I have been looking for a bit of information besides YouTube and Google as in this brief dialogue.

I understand Windows has to be installed in the way the BIOS/UEFI was setup.

I assume that means what it says that you set up the BIOS one way and that is how Windows is installed -whether it is MBR or GPT.

I was hoping to be able to switch from legacy to UEFI for security purposes and when I needed to boot from a stick would temporarily disable secure boot, set the boot order then once done would resume UEFI.

I think it wise I learn but not tinker as it is over my head. The Asus's board is really chock full of choices, both EZ and advanced and I was hoping to use just those I need. Legacy is a double edged sword in this case because it is EZ and keeps me from causing trouble but also hinders me from learning when I have to boot.

I read an interesting article which said that legacy will not be around in a decade. of course that is opinion and much will change in a decade anyway.  Then users would have to use UEFI and alter the UEFI when they wanted to boot. I guess I am lucky to have it in a way, for simplicity's sake.

Because system information says UEFI I likely am in that mode but with secure boot disabled and legacy boot enabled, would you agree?

You are using UEFI as GPT requires UEFI, won't work otherwise.

You can have UEFI/GPT or UEFI/MBR or BIOS(Legacy/CSM)/MBR. 

 

From Wikipedia: The Compatibility Support Module (CSM) is a component of the UEFI firmware that provides legacy BIOS compatibility by emulating a BIOS environment, allowing legacy operating systems and some option ROMs that do not support UEFI to still be used

Your info is helping me narrow things down. I do see where i have UEFI with GPT(rt clicked 0 and properties say GPT).

Secure boot is off - system information..

I have yet to find whether I have Legacy enabled or not. but will keep looking.

I am creating a folder with notes. Do you find any errors so far?

UEFI= GPT and BIOS = MBR

To convert from BIOS to UEFI you first have to use Windows 10 – MBR2GPT disk conversion tool.

Once done, you go to firmware settings like UEFI and make similar changes.

UEFI = Hold shift and click restart to go to UEFI/BIOS

Or -just tap F2 or delete to enter, then click the drive you want when screen appears to boot from.

Also use settings>recover>etc to UEFI

To enable CSM or Legacy = disable secure boot first then enable legacy

I did find that I have legacy enabled so that makes legacy, GPT and UEFI

It appears it was set up as UEFI and then legacy was enabled.

I would assume when I reinstall the OS I create the stick from the MCT then use it to reinstall cleanly af necessary.

I am creating a folder with notes. Do you find any errors so far?

 

UEFI= GPT and BIOS = MBR

 

UEFI Can be GPT or MBR, BIOS = MBR

 

To convert from BIOS to UEFI you first have to use Windows 10 – MBR2GPT disk conversion tool.

Once done, you go to firmware settings like UEFI and make similar changes.

 

No, UEFI handles MBR just fine. Moot point since you already have  GPT setup. MBR or GPT is a separate considration.

If you switch from MBR to UEFI I don't know if your system will boot or not.

 

UEFI = Hold shift and click restart to go to UEFI/BIOS

Or -just tap F2 or delete to enter, then click the drive you want when screen appears to boot from.

Also use settings>recover>etc to UEFI

 

To enable CSM or Legacy = disable secure boot first then enable legacy

I did find that I have legacy enabled so that makes legacy, GPT and UEFI

 

Yes, that's fine. Just means you don't have secure boot and can boot DVDs and flash drives (non-OS boot files)

 

It appears it was set up as UEFI and then legacy was enabled.

 

Maybe, wouldn't really matter.

 

I would assume when I reinstall the OS I create the stick from the MCT then use it to reinstall cleanly af necessary.

 

Yes, MCT create a flash drive (stick) that will install under UEFI or Legacy.

Thank you - more for the folder.

I was imaging  with Macrium and noticed the source as MBR. I know the PC is GPT. After the image I checked and the external drive is MBR while the PC is GPT.

I then recovered to check and ll seems OK It appears  that the external drive being MBR does not affect the functioning of the image and recovery. I could format and partition the external drive but do not think it is necessary.

This seems to fit in with what you wrote.

Given that boards differ, does the setup below seem accurate;

Legacy Support  Off or Disabled

Boot Device Control UEFI

Legacy CSM Off 

Launch CSM Off or Disabled

CSM Off or Disabled

UEFI  UEFI Only

Boot Mode No Legacy Support

Boot Option Filter UEFI Only

UEFI Legacy Boot Priority UEFI First or UEFI Only

1-Should this last one be UEFI only??

2-Would enabling UEFI and disabling legacy enable secure boot or should it be done manually?

I think you should leave it ASIS until you get to a point where you want to start over with a Clean Install, then once you have good backups, wipe the boot drive so it is a raw unformatted drive, which cna be done during the install process.

Create a bootable flash drive using MCT so it will work with CSM/MBR or UEFI/GPT then setup UEFI so it is pure UEFI, no CSM, no Legacy.

Legacy Support  Off or Disabled

Boot Device Control UEFI

Legacy CSM Off 

Launch CSM Off or Disabled

CSM Off or Disabled

UEFI  UEFI Only

Boot Mode No Legacy Support

Boot Option Filter UEFI Only

UEFI Legacy Boot Priority UEFI First