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Not sure if it'll help but did try recreating the GRUB EFI firmware on your EFI system partition?
How can i do that? -----BEGIN PGP SIGNATURE----- Version: APG v1.1.1 iQJCBAEBCgAsBQJTkDxsJRxEaW1pdHJpcyBaZXJ2YXMgPGR6ZXJ2YXNAZHplcnZh cy5ncj4ACgkQ+77hPkfJypYt/g/+O2CpcpsWCnvWg8GoFBrz0v8iXMDFumqWz5Aj TRzYrFCj+k3jNWDOMhOE6BzKpDqK42nCsg+Kd3SaBdcGnhLBqNFJJBP/RZt0OpaN hRK9sq4b+J35S6VeDTPao3s1Y+BVmlG7xXIa6bmnJbtl+WAB4+R9qCOaK4laRVye hCr5a/DUCI0xRJWySGJ1ByQ3ebGr6AWgFCYdkAjiuumNS3jUcLNsvh5POQtiYRuD fEs+lA1pNbSkMDVAPOoBaHxPrdcHnPa0GfZ4QwXV6bufAFs0How25BwG0b4DX6yG hVi22uqaIkFi4aP8MRhoP/uuvhY27oxwLVyYH3h7Sey5fcp+nD2YWJCfcunQvRXj 3cBl+L13D/KMzIBBkop23Sk4OdpKjFn2chBCLr0hddls5hsfcuAfovFISQIuHoUs QZrAQNVx/ZrlRgKJ88wOztgKdasaOBwv7hb4l+XbdGCMWcSDvvMTQdi/gKCUuZwU jxMm8dlikOAkSGZ9dWIozRNczpbJgKlujq3VvsGydBXaFxtnn7yGLjC8+4dEPMbV +dskTrngMdcBGHtL079/Qe0+U77u0JCZhnh7KpAa7TiYOI+He9dGPX6NOSytsV9Z ZbgZk8ysuQurw5TkOPOGuW18aY6KeZbNthWmTbLj61ulwDpgKSYQoarqNfNSAcp4 LYm7r+M= =CAuL -----END PGP SIGNATURE-----