Acer Aspire E5-576g is unbootable with SSD while on UEFI boot mode

RaviF

My laptop is Acer Aspire E5-576g which has a Transcend 240GB M.2 SSD 820S installed when buying the laptop and Windows 10 Pro 1803 version is installed to the SSD. I used it for nearly 8 months without any problem. Today when I boot up my laptop, an error message appeared as "No Bootable Device Found". Then I Googled the error and found a solution, changed Boot Mode from "UEFI" to "Legacy" and restarted. Then the laptop restarted properly. I have few questions on this.

1. Why this would happen on UEFI mode ?(Is that because it boot from the SSD?)
2. What is the difference of using Legacy mode rather than UEFI? (Are there any consequences?)
3. I saw many Acer users have reported this problem. Is that a common issue of Acer laptops?
4. Is there any permanent solution for this issue?

Thanks 

Commodore_1995#

1) This happens when the bootable boot partition of windows is corrupted, or when the ssd or hd is badly connected on the motherboard!

2) Legacy mode simulates the old bios, which requires an mbr partition. Currently, it is not called bios anymore, but UEFI. Legacy mode supports the installation of windows x86 or x64.

Uefi has some extra layers of security, and it also allows the user to install hds with more than 2tbs, converted to a gpt partition. In notebooks, it only allows the installation of windows x64. On tablets, uefi mode supports the installation of windows x86!

3) This is not a problem unique to Acer. Look into the dell, lenovo and asus communities that you will encounter similar problems!

4) It is possible that a uefi update can solve the problem!