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BIOS identification string
The IBM BIOS identification string can be found within BIOS or can be read out using IBM Thinkpad Utilities.
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IBM ThinkPad 240
IRET64WW

IBM ThinkPad 770X
IIET41WW

IBM ThinkPad 760XD
HEXET60WW 09 Dec 1999

IBM ThinkPad A22p / A21p
1.00 KYET21WW 21 Dec 1999
1.01 KYET22WW 29 Sep 2000
1.02 KYET23WW 13 Oct 2000
1.03 KYET24WW 07 Nov 2000
1.04 KYET27WW 19 Dec 2000
1.05 KYET31WW 06 Mar 2001
1.06 KYET32WW 27 Jun 2001
1.07 KYET33WW 05 Sep 2001

IBM ThinkPad 600
1.11 IBET54WW 12 Oct 2001

IBM ThinkPad 600E
1.11 IHET47WW 12 Oct 2001 (some 2645 releases)
1.11 INET36WW 12 Oct 2001 (2646 and some 2645 releases)

IBM ThinkPad 600X
1.11 ITET55WW 12 Oct 2001

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