Follow-up Comment #7, bug #46817 (project grub): I've sent output of bootinfoscript to you by email and prepared a PL2302 USB-RS232 adapter, but I don't know how to enable usbserial and debug GRUB. I made a rescue image and it can boot to command line of GRUB. My harddisk's model is Toshiba MK7575GSX with 512 byte sector.
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