How to remove Ubuntu item from UEFI and grub leftovers?

Question

linux

Installed ubuntu next to windows 10. Played with it, had problems - deleted it from disk. But in uefi, the ubuntu item remained in the boot tab. There is a delete boot item - I used it, but after a reboot it appears again. I tried to mount the EFI partition and manually delete the ubuntu folder, but access is denied.

:m
Отказано в доступе

dir m:
Том в устройстве М имеет метку SYSTEM
Серийный номер тома: xxxx-xxxx
Содержимое папки М:\
Файл не найден

What to do?

Answer 1

What to do?

Install Ubuntu and give up Windows ;-)

Answer 2

EasyUEFI will help get rid of the African nedos once and for all EasyUEFI - kill your ubuntu