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中国DOS联盟论坛 The time now is 2026-08-25 22:38 |
47,812 topics / 349,910 posts / today 0 new / 48,264 members |
| 其它操作系统综合讨论区 » Cracking a CMOS password |
| Printable Version 2,235 / 15 |
| Floor1 priscilla | Posted 2003-06-25 00:00 |
| 初级用户 Posts 19 Credits 186 | |
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The computer at my workplace is a Lenovo machine, I forget what series it is (P4 2.4G). A CMOS password was set, the kind where it asks for a password as soon as you power on. It was changed several times by someone, and now nobody knows what it is anymore. Is there any way to crack it without opening the case?
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| Floor2 hunome | Posted 2003-06-25 00:00 |
| 银牌会员 Posts 721 Credits 2,265 | |
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Yes, use debug.
Search with Google. |
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| Floor3 priscilla | Posted 2003-06-25 00:00 |
| 初级用户 Posts 19 Credits 186 | |
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The bad thing is I can't even get into DOS (booting from the hard drive).
It asks for the password as soon as it powers on!!! |
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| Floor4 FriedFish | Posted 2003-06-25 00:00 |
| 初级用户 Posts 7 Credits 129 | |
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Without opening the case, it seems there's no other way
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| Floor5 hunome | Posted 2003-06-25 00:00 |
| 银牌会员 Posts 721 Credits 2,265 | |
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Then that won't work, you'll have to discharge it.
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| Floor6 JAMESLIU | Posted 2003-06-25 00:00 |
| 初级用户 Posts 2 Credits 104 | |
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Use DEBUG under DOS
C:\DEBUG -O 70 10 -O 71 00 -Q Just reboot after that. This clears COMS, and it can also clear the password |
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| Floor7 JAMESLIU | Posted 2003-06-25 00:00 |
| 初级用户 Posts 2 Credits 104 | |
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I didn't read it clearly just now,
then you'd better remove the battery. Opening the case is no problem, Lenovo will still honor the warranty! |
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| Floor8 红色狂想 | Posted 2003-06-26 00:00 |
| 金牌会员 Posts 1,501 Credits 4,289 From 河南省 | |
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Since yours is a Lenovo brand-name machine, why not contact the manufacturer? Wouldn't that be safer?
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| Floor9 piaoyi | Posted 2003-06-26 00:00 |
| 初级用户 Posts 10 Credits 125 | |
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The simplest way is to open the case.
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| Floor10 zhuying88 | Posted 2003-07-10 00:00 |
| 初级用户 Posts 57 Credits 240 | |
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No chance
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| Floor11 没有童话时 | Posted 2003-07-15 00:00 |
| 初级用户 Posts 1 Credits 102 | |
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Open the case, don't hold back
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| Floor12 saaski | Posted 2003-07-16 00:00 |
| 初级用户 Posts 35 Credits 227 | |
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If it's a laptop, opening the case won't help either. You'll have to go to the manufacturer or a repair shop to crack the password. You can also find the chip that stores the password, remove it, read it with a chip reader, and then analyze it to find the password.
If it's a desktop, then you can. (1) debug cracking method After entering DOS, type or or — o 70 10 — o 70 10 — o 70 20 — o 71 ff — o 71 10 — o 71 20 — q — q —q (2) utility software cracking method (3) BIOS flashing method (4) battery discharge method (5) jumper discharge method |
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| Floor13 saaski | Posted 2003-07-18 00:00 |
| 初级用户 Posts 35 Credits 227 | |
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Another way is to change the computer's hardware setup, temporarily unplug the sound card, network card, hard drive, or floppy drive, then reboot the computer. The BIOS firmware first checks whether the machine's hardware configuration matches the parameters in COMS, and if they don't match, it will initialize the COMS parameters at startup.
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| Floor14 覆水难收 | Posted 2003-07-19 00:00 |
| 中级用户 Posts 30 Credits 229 | |
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Discharge it
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| Floor15 小兵张嘎 | Posted 2003-07-24 00:00 |
| 初级用户 Posts 3 Credits 110 | |
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Won't booting from a floppy work? Then switch to the C drive, use the DEBUG command to clear the CMOS password, and then set the power-on password again.
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