acer aspire 3 help

so my daughter bought a acer aspire 3 laptop, doesnt get on with 10 so asked if i could put 7 on it
i have 3 genuine 7 discs but this laptop doesnt have a dvd drive.
i made a bootable usb with rufus but it wont boot from usb

googled for help and found i need to change from uefi to legacy

in bios it wont let me change to legacy and google search shows acer may have removed the option for some reason

so i found a thread that says create usb in rufus but change to gpt.

still no good, so ive tried creating a usb with my windows 10 dvd
still wont boot the usb.

ive even tried booting a linus usb with no joy
at a loss guys

any help appreciated

Better to ask at sevenforums. Do you have the full model number for the laptop to give them?

There is a rather large number of different Aspire 3 models so I wan't sure which user guide to try looking at, but in general, here are some things to try:

Try going into the BIOS and looking for an option to allow you to set the boot order. From the one user guide I looked at it appears that once in the BIOS you may have to select "Boot" from the categories at the top of the screen and you should then have the boot order options available.

In addition, some systems have a key you can press during boot that will bring up a list of devices that you can boot from so that you can select the one you want.

If everything looks like it should be configured to allow you to boot from a flash drive but it's still not working, then try this method of creating the flash disk. This has always worked for me on both BIOS and UEFI based systems.

NOTE: You need to do this from another Windows 10 system, version 1703 or later, NOT Windows 7!

Create bootable USB installer if install.wim is greater than 4GB

Make sure secure boot is disabled first. If there is an option for OS type, set it to Other.

ok thanks
yes model is N19C1

tried 2 external dvd drives, wont boot any of my dvds, i know the drives are good as i use them on my business laptop