If you know how to make an Evox boot disc then go ahead and make one with this ini on it, boot it and lock it.

[Misc]

AutoLaunchGames = No
AutoLaunchDVD = No
DVDPlayer = "f:\apps\dvd2.0\default.xbe"
AutoLaunchAudio = No
#AudioPlayer = "c:\xboxdash.xbe"
MSDashBoard = "c:\xboxdash.xbe"
UseFDrive = Yes
UseGDrive = Yes
SkinName = Original
#SkinName = RuDeDuDe2
UseItems = No
ScreenSaver = 5
Fahrenheit = No
ShadeLevel = 90
EnableSMART = Yes
HDD_Temp_ID = 194
ChameleonLed = 15
TSR_Type = 0
IGR = No
GameRegion = 0


[Network]

SetupNetwork = Yes
StaticIP = Yes
Ip = 192.168.100.10
Subnetmask = 255.255.255.0
Defaultgateway = 192.168.100.1
DNS1 = 0.0.0.0
DNS2 = 0.0.0.0
SetupDelay = 0
SkipIfNoLink = No

[Clock]

JumpToMsDash = No
JumpIfNoLink = Yes
Use24 = Yes
SwapDate = No
SNTP_Server = 0.0.0.0

[FTP]

Enable = Yes
Password = xbox

[Telnet]

Enable = Yes

[RDTOOLS]

Enable = Yes
Name = XBOX_V1.0

[BIOS]

#
ROM = "EvoX 2.0",0x76fd88337b8d8c1f116f85f3984b98b6
ROM = "EvoX 2.1",0x99487615bb30670cb65993388fcf2a63
ROM = "EvoX 2.2",0x220ade778785cfc3c98bb5ea8bbd8608
ROM = "EvoX 2.3",0xd79bc87c2caa1a50dcc7016adf2ccc0a
ROM = "EvoX 2.4",0xe3ce66b99957a92fdac40af951c3f1fd
#
Flash = 0x01d5,"AMD - Am29F080B",0x100000
Flash = 0x04d5,"FUJITSU - MBM29F080A",0x100000
Flash = 0xadd5,"Hynix - HY29F080",0x100000
Flash = 0x20f1,"ST - M29F080A",0x100000
Flash = 0xbf61,"SST - 49LF020",0x40000
#Flash = 0x378c,"AMIC - A29002",0x40000
Current = 0xc349c2b047a3d6c2de2e1c10185ecf86

[Skin_Original]

#
# <Time> =
# <IP> =
# <Name>
# <Version>
# <CD>
# <Temp3>
# <BIOSVer>
# <KernelVer>
# <RDName>
# <SpaceC>
# <SpaceE>
# <SpaceF>
# <SpaceG>
# <SpaceX>
# <SpaceY>
# <SpaceZ>
#
Text = 30,37,0.5,0x000000,0,"<Time>"
Text = 28,39,0.5,0x808080,0,"<Time>"
Text = 620,420,0.5,0x000000,1,"<Name> V<Version>"
Text = 618,422,0.5,0x808080,1,"<Name> V<Version>"
Text = 620,37,0.5,0x000000,1,"<CD>"
Text = 618,39,0.5,0x808080,1,"<CD>"
Text = 30,420,0.5,0x000000,0,"RD Name : <RDName>"
Text = 28,422,0.5,0x808080,0,"RD Name : <RDName>"
LogoType= 0


[Menu]

Section "Root"
{
Item "Launch DVD",ID_Launch_DVD
Item "Trainers",ID_trainer
Item "MS Dashboard",ID_MS_Dash
Item "Reboot",ID_Quick_Reboot
# Item "Power Cycle",ID_Full_Reboot
Item "Power Off",ID_Power_Off
Item "Lock Harddisk",@210
Item "Unlock Harddisk",@211
Section "System Utils"
{
Item "Settings",ID_Settings
Item "Flash BIOS",ID_Flash_Bios
Item "Backup",ID_Backup
Item "Skins",ID_Skins
}
Section "Launch Menu"
{
Section "Games"
{
AutoAddItem "e:\games\"
AutoAddItem "f:\games\"
SortAll
}
Section "Apps"
{
AutoAddItem "e:\apps\"
AutoAddItem "f:\apps\"
SortAll
}
}
}

[Action_10]

LogFile = "f:\lock.log"
Info "This function will lock your XBOX Harddisk"
Warning "You will now lock your XBOX harddisk and will be able"
Warning "to boot from an original XBOX bios"
#

hddlockenable

[Action_11]

LogFile = "f:\unlock.log"
Info "This function will unlock your XBOX Harddisk"
Warning "You will now unlock your XBOX harddisk and will not be able"
Warning "to boot from an original XBOX bios"
#
hddlockdisable

Yes you can, just download Flash FXP or Smart FTP, link your XBOX and your computer with a crossover cable or an XBOX link cable, boot your XBOX and FTP to it, see the tuts about FTP'n to the XBOX.