本来一直在用，但今天忽然不能启动了，就重新制作ventoy，制作提示成功。但无法启动U盘，boot fail。于是换版重新制作ventoy，结果问题来了，制作也不成了。不会是我的u盘坏了吧。日志如下：

[2022/08/16 23:30:10.020] SpaceMB:0 SizeInMB:122112
[2022/08/16 23:30:10.020] #####################################################
[2022/08/16 23:30:10.026] InstallVentoy2PhyDrive try1 MBR PhyDrive2 <>
[2022/08/16 23:30:10.035] #####################################################
[2022/08/16 23:30:10.045] Disk signature: 0x4f333f99
[2022/08/16 23:30:10.045] ReservedSector: 0
[2022/08/16 23:30:10.056] Lock disk for clean .............................
[2022/08/16 23:30:10.066] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:10.075] [0] CreateFileA \.\PhysicalDrive2 code:0 00000348
[2022/08/16 23:30:10.075] FSCTL_LOCK_VOLUME success
[2022/08/16 23:30:10.085] LogicalDrive:\.\C: PhyDrive:0 Offset:449839104 ExtentLength:128243406336
[2022/08/16 23:30:10.105] LogicalDrive:\.\H: PhyDrive:0 Offset:414919426048 ExtentLength:91886697984
[2022/08/16 23:30:10.105] LogicalDrive:\.\I: PhyDrive:1 Offset:1048576 ExtentLength:500105740288
[2022/08/16 23:30:10.115] No drive letter was assigned...
[2022/08/16 23:30:10.121] GetFirstUnusedDriveLetter D: ...
[2022/08/16 23:30:10.126] Will use 'D:' as volume mountpoint
[2022/08/16 23:30:10.175] VDS init OK, service 030D402C
[2022/08/16 23:30:10.195] Callback 1 process for disk <\?\PhysicalDrive2>
[2022/08/16 23:30:10.195] Deleting ALL partitions from disk '\?\PhysicalDrive2':
[2022/08/16 23:30:10.206] * Partition 1 (offset: 0, size: 128043712512) delete it.
[2022/08/16 23:30:10.235] Could not delete partitions: 0x80070032
[2022/08/16 23:30:10.235] VDS_DeleteAllPartitions 2 ret:0 (FAIL)
[2022/08/16 23:30:10.245] Notice: Could not delete partitions: 0xb7, but we continue.
[2022/08/16 23:30:10.254] Deleting all partitions ......................... OK
[2022/08/16 23:30:10.264] Lock disk for write .............................
[2022/08/16 23:30:10.270] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:10.285] [0] CreateFileA \.\PhysicalDrive2 code:0 000003A4
[2022/08/16 23:30:10.285] Opened \.\PhysicalDrive2 for exclusive write access
[2022/08/16 23:30:10.295] FSCTL_LOCK_VOLUME success
[2022/08/16 23:30:10.307] Formatting part1 exFAT ...
[2022/08/16 23:30:10.309] Formatting Part1 exFAT ...
[2022/08/16 23:30:10.331] WriteFile error bRet:0 WriteSize:4608 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.331] WriteFile error bRet:0 WriteSize:122368 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.341] WriteFile error bRet:0 WriteSize:3906560 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.350] WriteFile error bRet:0 WriteSize:131072 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.355] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.355] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.366] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.380] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.385] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.395] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.405] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.410] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.421] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.430] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.435] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.445] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.455] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.460] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.470] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.480] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.485] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.496] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.506] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.510] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.521] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.530] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.535] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.545] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:10.555] Formatting Part1 exFAT success
[2022/08/16 23:30:10.565] Writing part2 FAT img ...
[2022/08/16 23:30:10.570] FormatPart2Fat 250019840...
[2022/08/16 23:30:10.590] Malloc whole img buffer success, now decompress ...
[2022/08/16 23:30:11.496] decompress finished success
[2022/08/16 23:30:11.496] VentoyProcSecureBoot 0 ...
[2022/08/16 23:30:11.512] Open ventoy efi file 00CA53A8
[2022/08/16 23:30:11.512] ventoy efi file size 1748992 ...
[2022/08/16 23:30:11.528] Now delete all efi files ...
[2022/08/16 23:30:11.528] Open bootx64 efi file 00CA53A8
[2022/08/16 23:30:12.403] Open ventoy efi file 00CA57EC
[2022/08/16 23:30:12.403] ventoy efi file size 1179648 ...
[2022/08/16 23:30:12.418] Now delete all efi files ...
[2022/08/16 23:30:12.418] Open bootia32 efi file 00CA53A8
[2022/08/16 23:30:13.137] Write part data bRet:0 dwSize:0 code:21
[2022/08/16 23:30:13.137] FormatPart2Fat failed.
[2022/08/16 23:30:13.153] FindProcessOccupyDisk for PhyDrive 2
[2022/08/16 23:30:13.153] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:13.168] handles->NumberOfHandles = 54055
[2022/08/16 23:30:13.168] NOTE: Could not identify the process(es) or service(s) accessing \Device\Harddisk2\DR4
[2022/08/16 23:30:13.184] This time install failed, clean disk, wait 5s and retry...
[2022/08/16 23:30:13.184] VDS init OK, service 0309BC34
[2022/08/16 23:30:13.348] Callback 1 process for disk <\?\PhysicalDrive2>
[2022/08/16 23:30:13.871] QueryStatus invalid status:2147942421
[2022/08/16 23:30:14.387] Could not clean disk 0x80070015 err:2147942421
[2022/08/16 23:30:14.387] VDS_CleanDisk 2 ret:0 (FAIL)
[2022/08/16 23:30:19.420] Now retry to install...
[2022/08/16 23:30:19.420] #####################################################
[2022/08/16 23:30:19.435] InstallVentoy2PhyDrive try2 MBR PhyDrive2 <>
[2022/08/16 23:30:19.451] #####################################################
[2022/08/16 23:30:19.466] Disk signature: 0x5ebd7824
[2022/08/16 23:30:19.482] ReservedSector: 0
[2022/08/16 23:30:19.482] Lock disk for clean .............................
[2022/08/16 23:30:19.498] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:19.513] [0] CreateFileA \.\PhysicalDrive2 code:0 000003D4
[2022/08/16 23:30:19.513] FSCTL_LOCK_VOLUME success
[2022/08/16 23:30:19.529] LogicalDrive:\.\C: PhyDrive:0 Offset:449839104 ExtentLength:128243406336
[2022/08/16 23:30:19.545] LogicalDrive:\.\H: PhyDrive:0 Offset:414919426048 ExtentLength:91886697984
[2022/08/16 23:30:19.545] LogicalDrive:\.\I: PhyDrive:1 Offset:1048576 ExtentLength:500105740288
[2022/08/16 23:30:19.560] No drive letter was assigned...
[2022/08/16 23:30:19.560] GetFirstUnusedDriveLetter D: ...
[2022/08/16 23:30:19.576] Will use 'D:' as volume mountpoint
[2022/08/16 23:30:19.623] VDS init OK, service 00FE8264
[2022/08/16 23:30:19.638] Callback 1 process for disk <\?\PhysicalDrive2>
[2022/08/16 23:30:19.638] Deleting ALL partitions from disk '\?\PhysicalDrive2':
[2022/08/16 23:30:19.638] * Partition 1 (offset: 0, size: 128043712512) delete it.
[2022/08/16 23:30:19.670] Could not delete partitions: 0x80070032
[2022/08/16 23:30:19.670] VDS_DeleteAllPartitions 2 ret:0 (FAIL)
[2022/08/16 23:30:19.685] Notice: Could not delete partitions: 0xb7, but we continue.
[2022/08/16 23:30:19.685] Deleting all partitions ......................... OK
[2022/08/16 23:30:19.701] Lock disk for write .............................
[2022/08/16 23:30:19.701] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:19.716] [0] CreateFileA \.\PhysicalDrive2 code:0 00000454
[2022/08/16 23:30:19.716] Opened \.\PhysicalDrive2 for exclusive write access
[2022/08/16 23:30:19.732] FSCTL_LOCK_VOLUME success
[2022/08/16 23:30:19.748] Formatting part1 exFAT ...
[2022/08/16 23:30:19.748] Formatting Part1 exFAT ...
[2022/08/16 23:30:19.763] WriteFile error bRet:0 WriteSize:4608 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.779] WriteFile error bRet:0 WriteSize:122368 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.779] WriteFile error bRet:0 WriteSize:3906560 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.795] WriteFile error bRet:0 WriteSize:131072 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.795] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.810] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.810] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.826] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.826] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.841] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.841] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.857] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.857] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.873] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.873] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.888] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.888] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.904] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.904] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.920] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.935] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.935] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.951] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.951] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.966] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.966] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.982] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.982] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:19.998] Formatting Part1 exFAT success
[2022/08/16 23:30:19.998] Writing part2 FAT img ...
[2022/08/16 23:30:20.013] FormatPart2Fat 250019840...
[2022/08/16 23:30:20.029] Malloc whole img buffer success, now decompress ...
[2022/08/16 23:30:20.951] decompress finished success
[2022/08/16 23:30:20.951] VentoyProcSecureBoot 0 ...
[2022/08/16 23:30:20.966] Open ventoy efi file 00CA53A8
[2022/08/16 23:30:20.966] ventoy efi file size 1748992 ...
[2022/08/16 23:30:20.982] Now delete all efi files ...
[2022/08/16 23:30:20.982] Open bootx64 efi file 00CA53A8
[2022/08/16 23:30:21.873] Open ventoy efi file 00CA57EC
[2022/08/16 23:30:21.873] ventoy efi file size 1179648 ...
[2022/08/16 23:30:21.873] Now delete all efi files ...
[2022/08/16 23:30:21.888] Open bootia32 efi file 00CA53A8
[2022/08/16 23:30:22.591] Write part data bRet:0 dwSize:0 code:21
[2022/08/16 23:30:22.591] FormatPart2Fat failed.
[2022/08/16 23:30:22.607] FindProcessOccupyDisk for PhyDrive 2
[2022/08/16 23:30:22.607] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:22.623] handles->NumberOfHandles = 54321
[2022/08/16 23:30:22.623] NOTE: Could not identify the process(es) or service(s) accessing \Device\Harddisk2\DR4
[2022/08/16 23:30:22.638] This time install failed, clean disk, wait 10s and retry...
[2022/08/16 23:30:22.654] CleanDiskByDiskpart <2>
[2022/08/16 23:30:22.654] CreateProcess
[2022/08/16 23:30:22.670] Wair process ...
[2022/08/16 23:30:23.013] Process finished...
[2022/08/16 23:30:33.038] Now retry to install...
[2022/08/16 23:30:33.038] #####################################################
[2022/08/16 23:30:33.053] InstallVentoy2PhyDrive try3 MBR PhyDrive2 <>
[2022/08/16 23:30:33.069] #####################################################
[2022/08/16 23:30:33.084] Disk signature: 0xe165f809
[2022/08/16 23:30:33.100] ReservedSector: 0
[2022/08/16 23:30:33.116] Lock disk for clean .............................
[2022/08/16 23:30:33.116] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:33.131] [0] CreateFileA \.\PhysicalDrive2 code:0 00000428
[2022/08/16 23:30:33.147] FSCTL_LOCK_VOLUME success
[2022/08/16 23:30:33.147] LogicalDrive:\.\C: PhyDrive:0 Offset:449839104 ExtentLength:128243406336
[2022/08/16 23:30:33.163] LogicalDrive:\.\H: PhyDrive:0 Offset:414919426048 ExtentLength:91886697984
[2022/08/16 23:30:33.178] LogicalDrive:\.\I: PhyDrive:1 Offset:1048576 ExtentLength:500105740288
[2022/08/16 23:30:33.178] No drive letter was assigned...
[2022/08/16 23:30:33.194] GetFirstUnusedDriveLetter D: ...
[2022/08/16 23:30:33.194] Will use 'D:' as volume mountpoint
[2022/08/16 23:30:33.241] VDS init OK, service 030DAFCC
[2022/08/16 23:30:33.256] Callback 1 process for disk <\?\PhysicalDrive2>
[2022/08/16 23:30:33.256] Deleting ALL partitions from disk '\?\PhysicalDrive2':
[2022/08/16 23:30:33.272] * Partition 1 (offset: 0, size: 128043712512) delete it.
[2022/08/16 23:30:33.303] Could not delete partitions: 0x80070032
[2022/08/16 23:30:33.303] VDS_DeleteAllPartitions 2 ret:0 (FAIL)
[2022/08/16 23:30:33.303] Notice: Could not delete partitions: 0xb7, but we continue.
[2022/08/16 23:30:33.319] Deleting all partitions ......................... OK
[2022/08/16 23:30:33.334] Lock disk for write .............................
[2022/08/16 23:30:33.334] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:33.350] [0] CreateFileA \.\PhysicalDrive2 code:0 000003C4
[2022/08/16 23:30:33.350] Opened \.\PhysicalDrive2 for exclusive write access
[2022/08/16 23:30:33.366] FSCTL_LOCK_VOLUME success
[2022/08/16 23:30:33.381] Formatting part1 exFAT ...
[2022/08/16 23:30:33.381] Formatting Part1 exFAT ...
[2022/08/16 23:30:33.397] WriteFile error bRet:0 WriteSize:4608 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.397] WriteFile error bRet:0 WriteSize:122368 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.413] WriteFile error bRet:0 WriteSize:3906560 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.428] WriteFile error bRet:0 WriteSize:131072 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.428] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.444] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.444] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.460] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.460] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.475] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.475] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.491] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.506] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.506] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.522] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.522] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.538] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.538] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.553] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.553] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.569] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.584] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.584] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.600] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.600] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.616] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.616] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.631] WriteFile error bRet:0 WriteSize:512 dwSize:0 ErrCode:21
[2022/08/16 23:30:33.631] Formatting Part1 exFAT success
[2022/08/16 23:30:33.647] Writing part2 FAT img ...
[2022/08/16 23:30:33.647] FormatPart2Fat 250019840...
[2022/08/16 23:30:33.678] Malloc whole img buffer success, now decompress ...
[2022/08/16 23:30:34.584] decompress finished success
[2022/08/16 23:30:34.584] VentoyProcSecureBoot 0 ...
[2022/08/16 23:30:34.600] Open ventoy efi file 00CA53A8
[2022/08/16 23:30:34.600] ventoy efi file size 1748992 ...
[2022/08/16 23:30:34.616] Now delete all efi files ...
[2022/08/16 23:30:34.631] Open bootx64 efi file 00CA53A8
[2022/08/16 23:30:35.506] Open ventoy efi file 00CA57EC
[2022/08/16 23:30:35.506] ventoy efi file size 1179648 ...
[2022/08/16 23:30:35.506] Now delete all efi files ...
[2022/08/16 23:30:35.522] Open bootia32 efi file 00CA53A8
[2022/08/16 23:30:36.225] Write part data bRet:0 dwSize:0 code:21
[2022/08/16 23:30:36.225] FormatPart2Fat failed.
[2022/08/16 23:30:36.241] FindProcessOccupyDisk for PhyDrive 2
[2022/08/16 23:30:36.241] QueryDosDeviceA success \Device\Harddisk2\DR4
[2022/08/16 23:30:36.256] handles->NumberOfHandles = 54233
[2022/08/16 23:30:36.256] NOTE: Could not identify the process(es) or service(s) accessing \Device\Harddisk2\DR4
[2022/08/16 23:30:39.645] Not ventoy disk, clear secure boot option