Can't restore factory image to CFI Flash in Cyclone V GT dev board

[Seadog]

I have a Cyclone V GT development board with a corrupted factory image in the CFI flash.  I have been able to update the User 1 image via the Board Update Portal.  But attempts to restore the factory image (per Section 4 of the User Guide) have all failed.  This is what I get if I run the command nios2-flash-programmer.exe -base=0x0000000 restore_c5gt_fpga_bup.flash --debug

No CFI table found at address 0x0000000A

Original contents (after writing 0xF0 and 0xFF00FF to address 0x0000000A):
0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
10: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
20: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
Contents after writing 0x980098 to address 0x000000B4:
0: 4F F9 04 00 FF FF FF FF FF FF FF FF FF FF FF FF O...............
10: FF FF FF FF FF FF 51 00 56 00 59 00 01 00 00 00 ......Q.V.Y.....
20: 0A 00 01 00 00 00 00 00 00 00 00 00 17 00 20 00 .............. .
30: 85 00 95 00 09 00 0A 00 0A 00 00 00 03 00 02 00 ................
40: 02 00 00 00 1B 00 01 00 00 00 0A 00 00 00 02 00 ................
Contents after writing 0x980098 to address 0x0000015E:
0: 4F F9 04 00 FF FF FF FF FF FF FF FF FF FF FF FF O...............
10: FF FF FF FF FF FF D1 00 52 00 59 00 01 00 00 00 ........R.Y.....
20: 0A 00 01 00 00 00 00 00 00 00 00 00 17 00 20 00 .............. .
30: 85 00 95 00 19 00 0A 00 0A 00 00 00 01 00 02 00 ................
40: 02 00 00 00 1B 00 01 00 00 00 0A 00 00 00 02 00 ................
Contents after writing 0x00980098 to address 0x000002B2:
Same after writing 0x980098 to address 0x0000005F:
Same after writing 0x980098 to address 0x000000B4:
Same after writing 0x00980098 to address 0x0000055A:
0: 4F F9 04 00 FF FF FF FF FF FF FF FF FF FF FF FF O...............
10: FF FF FF FF FF FF 51 00 52 00 59 00 01 00 00 00 ......Q.R.Y.....
20: 0A 00 01 00 00 00 00 00 00 00 00 00 17 00 20 00 .............. .
30: 85 00 95 00 09 00 0A 00 0A 00 00 00 01 00 02 00 ................
40: 02 00 00 00 1B 00 01 00 00 00 0A 00 00 00 02 00 ................
Contents after writing 0x00980098 to address 0x0000015E:
0: 4F F9 04 00 FF FF FF FF FF FF FF FF FF FF FF FF O...............
10: FF FF FF FF FF FF 51 00 52 00 59 00 01 00 00 00 ......Q.R.Y.....
20: 0A 00 01 00 00 00 00 00 00 00 00 00 17 00 20 00 .............. .
30: 85 00 95 00 09 00 0A 00 1A 00 00 00 01 00 02 00 ................
40: 02 00 00 00 1B 00 01 00 00 00 0A 00 00 00 02 00 ................
Contents after writing 0x980098 to address 0x0000015E:
0: 4F F9 04 00 FF FF FF FF FF FF FF FF FF FF FF FF O...............
10: FF FF FF FF FF FF 51 00 52 00 59 00 01 00 00 00 ......Q.R.Y.....
20: 0A 00 01 00 00 00 00 00 00 00 00 00 17 00 20 00 .............. .
30: 85 00 95 00 09 00 0B 00 0A 00 00 00 01 00 02 00 ................
40: 02 00 01 00 1B 00 01 00 00 00 0A 00 00 00 02 00 ................
Contents after writing 0x980098 to address 0x000002B2:
0: 4F F9 04 00 FF FF FF FF FF FF FF FF FF FF FF FF O...............
10: FF FF FF FF FF FF 51 00 52 00 59 00 01 00 00 00 ......Q.R.Y.....
20: 0A 00 03 00 00 00 00 00 00 00 00 00 17 00 20 00 .............. .
30: 85 00 95 00 09 00 0A 00 0A 00 00 00 01 00 02 00 ................
40: 02 00 00 00 1B 00 01 00 00 00 0A 00 00 00 02 00 ................
Ignored possible autoselect code 4F-04 as no override data
present in section [FLASH-4F-04]
Ignored possible autoselect code F94F-0005 as no override data
present in section [FLASH-F94F-0005]
Ignored possible autoselect code 0004F94F-FFFFFFFF as no override data
present in section [FLASH-0004F94F-FFFFFFFF]
Leaving target processor paused

Is there a way to fix this?

Thanks.