I have an Asus X550C laptop (with original bios ver 212) and disabled uefi boot from the "Secure Boot Control" option on the aptio utility then formatted its harddrive, installed Windows 7 and applied "X550CA_mod_All". Yes, it worked fine with Windows 7 exept there's no "Secure Boot Control" option shown longer. That did not matter however because I would not switch it back to secure uefi, before ... The problem is: Just recently I flashed over the modded ver 212 with original ver 300. Looks updating made the secure boot back and locked. Now I cannot make it access to any "non-secure" drive including a bootable cd, the harddrive, a usb stick... The builtin Easy Flash won't flash back to an older bios. This laptop model does not have ez flash back run by Home + Ctrl. Anything I shoud do before disassembling my laptop and looking for the spi to unsolder it? Thx in advance.