* CHECK BIOS DATE

CHECK BIOS DATE




The below debug routine is to check the date of your BIOS. All BIOS dates on PC compatible computers is stored at memory address FFFF5h. To display the date of your BIOS do the following: At the C:\> type debug - d FFFF:5 L 8 After typing the above command you should receive a string similar to: FFFF:0000 30 34 2F-33 30 2F 39 38 4/30/98 The 4/30/98 would be the date of your computer BIOS.

* ERASE HDD AND CMOS

ERASE HDD AND CLEAR CMOS



Before doing the below routine ensure that you read our disclaimer as well as are sure that this is safe to do on your hard drive. Some computer hard drive manufacturers may void your warranty or this may cause damage to the hard drive when doing the below example. This routine is useful in clearing DDO and removing possible viruses. If this routine completes successfully it will erase everything from your Hard Drive as well as your reset your CMOS values. In the below debug routine, only type what is in bold from line 3 to 17, you will get a response if typed in properly. If you get a response continue to type the bold text as shown below in the below example.
A:\>debug
-fcs:200 400 0
-acs:100
-xxxx:0100 mov ax, 0
-xxxx:0103 mov ax, cx
-xxxx:0105 out 70, al
-xxxx:0107 mov ax, 0
-xxxx:010a out 71,al
-xxxx:010c inc cx
-xxxx:010d cmp cx,100
-xxxx:0111 jb 103
-xxxx:0113 mov ax,302
-xxxx:0116 mov bx,200
-xxxx:0119 mov cx,1
-xxxx:011c mov dx,80
-xxxx:011f int 13
-xxxx:012l int 20
-xxxx:0123 (without typing anything.)
-g program terminated normally
If you are doing this debug routine to clear out a possible virus turn off your computer and wait and turn back on.
-q
Once back at DOS, reboot your computer When your computer comes back on from doing the above you will get an error message as booting up the computer, such as "Invalid Configuration". You must enter CMOS and set the time and date, save, and reboot again. Once rebooted, you will then need to run fdisk and recreate the partitions. Once created, you will then need to format the hard drive and proceed as normal.

* CMOS NEW TRICKS

Clear CMOS all Tricks
ENTERING DEBUG

Debug has been included in every version of MS-DOS as well as Windows. When running any of the debug routines it is recommended that if you have Windows that you exit or shut down to get into a real DOS prompt (unless you're running Windows ME, Windows 2000, Windows XP, or later versions).



Once at the MS- DOS prompt, run through the below example, this example is perfectly fine to run on any PC Computer running MS-DOS / Windows and will not harm anything.
Type debug and press enter.
This should get you to a - (small dash). This is the debug prompt.
At the - type d40:00 and press enter; this will return several lines of information.
After the feedback you will be back to the debug prompt.
To exit out of debug type q and press enter. This will return you back to the MS-DOS prompt.


In some of the below debug routines you will notice that a "g" is typed, then "q". G tells the computer that the code type is not self executing and must be run at this point. If completed, the program will return Program Terminated Normally which indicates you can now quit from the debug program. TESTING PORTS




The below debug routine will check the ports of the computer to allow you to know if ports are being detected or not. Type debug to get to the "-" Type D40:0
You should get several lines; however, the first line is the only important line, which should read the following:
0040:0000 F8 03 F8 02 E8 03 E8 02 - 78 03 78 02 BC 03
F8 03
F8 02
E8 03
E8 02

78 03
78 02
BC 03

COM1
COM2
COM3
COM4

LPT1
LPT2
LPT3


The above graph shows you what the feed back means as far as port, so if you see F8 03, this would be an indication that COM1 is being detected; if you see 00 00, this is an indication that it is not being detected, which could mean that hardware is bad or that it is disabled inCMOS
Once you have finished looking at the information, type Q and press enter to get out of Debug.
CLEAR CMOS




The below debug routine will clear CMOS, BIOS, Passwords, Settings, Viruses, and other items residing in the CMOS. During this process you may get returned characters which are an indication that the string has gone in, if you by chance get ERROR ensure that you have typed the line in correctly, if not retype. Ensure that you do not skip any lines, that it is ALL typed in correctly to help prevent problems. Before running this Debug routine also ensure that you have read the above disclaimer. After typing debug you will get "-" which is were you can begin by typing A and pressing enter. A
MOV AX,0
MOV AX,CX
OUT 70,AL
MOV AX,0
OUT 71,AL
INC CX
CMP CX,100
JB 103
INT 20
Note: Nothing is typed on this line
G By pressing G this will execute the above script, ensure you have read and agree to the above disclaimer.
Q Then reboot and you will get a Setup Checksum Error. Go into setup, correct all the incorrect values, time, date...

* FLASHING BIOS VIA DOS

Flashing BIOS via DOS


If you have access to the computer when it's turned on, you could try one of those programs that remove the password from the BIOS, by invalidating its memory.
However, it might happen you don't have one of those programs when you have access to the computer, so you'd better learn how to do manually what they do. You can reset the BIOS to its default values using the MS-DOS tool DEBUG (type DEBUG at the command prompt. You'd better do it in pure MS-DOS mode, not from a MS-DOS shell window in Windows). Once you are in the debug environment enter the following commands:
AMI/AWARD BIOS
O 70 17
O 71 17
Q
PHOENIX BIOS
O 70 FF
O 71 17
Q
GENERIC
Invalidates CMOS RAM.
Should work on all AT motherboards
(XT motherboards don't have CMOS)
O 70 2E
O 71 FF
Q
Note that the first letter is a "O" not the number "0". The numbers which follow are two bytes in hex format.

* BOIS BACKDOOR

Standard BIOS backdoor passwords


The first, less invasive, attempt to bypass a BIOS password is to try on of these standard manufacturer's backdoor passwords:
AWARD BIOS
AWARD SW, AWARD_SW, Award SW, AWARD PW, _award, awkward, J64, j256, j262, j332, j322, 01322222, 589589, 589721, 595595, 598598, HLT, SER, SKY_FOX, aLLy, aLLY, Condo, CONCAT, TTPTHA, aPAf, HLT, KDD, ZBAAACA, ZAAADA, ZJAAADC, djonet, %øåñòü ïpîáåëîâ%, %äåâÿòü ïpîáåëîâ%
AMI BIOS
AMI, A.M.I., AMI SW, AMI_SW, BIOS, PASSWORD, HEWITT RAND, Oder
Other passwords you may try (for AMI/AWARD or other BIOSes)
LKWPETER, lkwpeter, BIOSTAR, biostar, BIOSSTAR, biosstar, ALFAROME, Syxz, Wodj
Note that the key associated to "_" in the US keyboard corresponds to "?" in some European keyboards (such as Italian and German ones), so -- for example -- you should type AWARD?SW when using those keyboards. Also remember that passwords are Case Sensitive. The last two passwords in the AWARD BIOS list are in Russian.

* BOIS PASSWORD CRACK 2

Basic BIOS password crack - works 9.9 times out of ten

This is a password crack but it clears the BIOS such that the next time you start the PC, the CMOS does not ask for any password. Now if you are able to bring the DOS prompt up, then you will be able to change the BIOS setting to the default. To clear the CMOS do the following:
Get DOS prompt and type:
DEBUG hit enter
-o 70 2e hit enter
-o 71 ff hit enter
-q hit enter
exit hit enter
Restart the computer. It works on most versions of the AWARD BIOS.

* CLEAR BIOS PASSWORD

At command prompt type debug
you will get a - prompt where you can type the fallowing ( means hit enter, not type enter*)

A
MOV AX,0
MOV AX,CX
OUT 70,AL
MOV AX,0
OUT 71,AL
INC CX
CMP CX,100
JB 103
INT 20
just hit enter on this line
G
Q