Thank you all for the replies and sorry my late reply. Gordon, I downgraded a little bit, from f24 (grub2-efi-2.02-0.34.fc24.x86_64.rpm) to f22 (grub2-efi-2.02-0.18.fc22.x86_64.rpm) and everything is working for my needs. Chris, thank you for you tips, all the used modules are builtin. Analyzing the source code for both versions, I found an interesting change on grub-core\loader\efi\chainloader.c:382 ( I do not know if this change is broking what I need). In the newer version of grub, there is a call to grub_device_close(dev), so I'm wondering if this is causing the custom application to fail opening UEFI Network Protocols. Here is a link to a picture of the code difference: https://1drv.ms/i/s!AsJQCGQT6-QYnymMc77WIQntDizy My best regards, Leandro! -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://lists.fedoraproject.org/admin/lists/users@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org