How to reset my Asus to defaults

Hi everybody.

I have a dual-boot Asus F541U with Windows 10 (preinstalled) and Ubuntu (in a partition I created using the Windows Disk Manager).

Now, for several reason that are no important here, I want to reset the PC to its factory defaults but when I click Reset button I' asked to put in the Windows installation cd.
Now, Using Disk Management utility I see the Recovery partition:


but it looks like Windows don't detect it or can't access it.
I thought it could be because the partition has been moved out from its default position. What can I do to make it visible and usable again?
I also tried to follow a suggestion found in Internet: type 'e' in the Grub screen and after having delete all the text write thses lines and press F10

insmod part_gpt
insmod chain
set root='(hd0,gpt5)'
chainloader /Recovery/WindowsRE/boot.sdi

where gpt5 is because the partion is sda5 and hd0 because my Asus has just one hard disk. Doing this I get an undefined error: it just says that boot.sdi cannot be loaded.

Any suggestion will be very appreciated: keep in mind that I already plan to reinstall Ubuntu (or more precisely, I want to go back to Linux Mint), so it is not a problem deleting the Linux partitions, but will this be enough? Or do I have to move the recovery partition in another position? And in which position it should go?

Thank you fro any help.