On 03/27/21 00:30, Alex via groups.io wrote:

Hello there after installing Windows 10 and uninstalling it I'm unable
to see UEFI Shell 2.7 on my BIOS boot menu. I'm using ACER Aspire 7
A715-75G which had come with UEFI Shell 2.7 preinstalled. How can I
bring back that mini preinstalled UEFI Shell 2.7 back to the boot menu
on the UEFI Bios?

No clue, but you should be able to download a UEFI shell binary from:

https://github.com/tianocore/edk2/releases/tag/edk2-stable202002

(See "ShellBinPkg.zip".)

A more recent shell build has been requested here:

https://bugzilla.tianocore.org/show_bug.cgi?id=3178

Thanks
Laszlo