Windows 10: I changed to Legacy boot from UEFI now I want to go back/fix it.

I have an acer laptop with two hard disks, a primary 256GB SSD windows OS drive and a 1TB HDD with an external cooling pad for the laptop that draws power from the laptop.Two days back my laptop switched got off because my battery died and when I pugged it in and started the laptop , it was cycling on and off so I unplugged the cooling pad and manually shut down the system by holding the power button. Then when I started the system again it stared showing "no bootable device found".I searched online and I found a tutorial to troubleshoot and they suggested to switch my boot to legacy from UEFI

:)

 

How to change a legacy Boot W10 diskt to use UEFI Boot

Hi all,

I would like to modernize my well running W10 by changing the boot process to UEFI (Reason: Using NVmE SSDs or GPT sized disk). Because the system has many well configured apps used day by day a clean install would be the least favorable choice.

So my questions are:

• Is it possible to patch a fully installed and featured W10 from legacy boot to UEFI boot? And how?
• If possible: does a patched system needs a new activation (Its a migrated W10 from W7)?

BTW: I have already read lots of post dealing with UEFI. But I didn't find any usable answer yet.

TIA and best regards.

 

UEFI vs Legacy boot mode

I recommend you stick with legacy install instead to avoid any compatibility problem hardware or software. Uefi have the speed advantage for boot up but I don't find it to be a good trade-off for the compatibility problems that appeared. Secure boot for uefi is a pain if you decide to install multiple os as the other os is "locked" out. I used uefi for my previous install it is a lengthy install selecting the correct bios setting without borking the install. I'll move to uefi if I don't have a need for multiple os or legacy things. So far I seem to need it.

 

Support Had Me Change From UEFI to Legacy mode in BIOS Re: DISASTER

This was Acronis True Image 2018 support not MS or Lenovo (P51). Those familiar with True Image know that you can create bootable media on a flash drive to run the software. No problem with True Image 2017 but True Image 2018 did not work. Although the flash drive loaded the program the GUI was garbled and I was unable to navigate. Support had me switch from UEFI back to Legacy and that was a bad idea. Sorry for the caps but this was what I wrote back to Acronis support. FYI the rest of the message was not in caps:

SUPPORT: I have discussed this issue with the Experts team and they have suggested testing whether changing from UEFI to Legacy mode in BIOS fixes the issue or not. This step is suggested for testing purpose only.THAT WAS A TERRIBLE SUGGESTION. I WENT INTO THE BIOS AND DID AS YOU INSTRUCTED AND CHANGED FROM UEFI TO LEGACY. I CLICKED EXIT AND SAVE AND WITH THE FLASH DRIVE PLUGGED IN THE 2018 BOOTABLE MEDIA I WENT TO BOOT MENU OPTIONS AND CHOOSE BOOT FROM FLASH DRIVE AND I WAS DROPPED BACK INTO THE BOOT MENU OPTION. SEE ENCLOSED PICTURE. I THEN SELECTED BOOT FROM THE SSD DRIVE AND I WAS AGAIN STUCK IN A LOOP THAT DROPPED ME BACK INTO THE BOOT MENU OPTION. I THEN TRIED BOOTING FROM THE SECOND INTERNAL HDD OPTION AND AGAIN WAS DROPPED BACK INTO THE BOOT MENU. I COULD NOT GET BACK INTO THE BIOS TO CHANGE BACK TO UEFI FROM LEGACY. I HAD TO DO A HARD SHUTDOWN AND POWER BACK ON AND ONLY THEN WAS I ABLE TO GET INTO THE BIOS AND CHANGE BACK FROM LEGACY TO UEFI.

This is a pic of the loop I was caught up in. Why do you all think I was not able to boot either from the flash drive or the SSD or the HDD once I changed from UEFI to Legacy in the BIOS? TIA.