1  # Lenovo T4xx series disassembly instructions
 2  
 3  A skilled engineer takes around 40 minutes to disassemble, flash and reassemble
 4  the whole device.
 5  
 6  Read their [Hardware Maintenance Manual](thinkpad_hmm.md) for detailed steps.
 7  
 8  ## Steps to access the flash IC
 9  
10  * Unplug the main battery
11  * Remove the harddisk, CDROM, ExpressCard, SIM-card, SDcard, SmartCard, ...
12  * Open the bottom flap and remove the keyboard screw
13  * Remove the keyboard
14  * Remove the screen
15  * Remove the top enclosure
16  * Remove the CMOS battery
17  * Remove the speakers
18  * Remove WWAN and WIFI card
19  * Remove the CPU fan
20  * Unplug the power cable
21  * Remove the bottom enclosure
22  * Flip the mainboard and remove the main frame
23  
24  ## Docking stations
25  The following docking stations are supported by coreboot:
26  * Type 2505
27    * VGA, Ethernet, Modem, PS2, 4 USB Ports
28    * Dock ID on pc87382 reads as: 2
29  * Type 2504
30    * Serial, LPT, LEDs, Audio, DVI, VGA, Ethernet, Modem, PS2, 4 USB Ports
31    * Dock ID on pc87382 reads as: 1
32    * PNP IO address of SuperIO pc87384: 0x2e
33  
34  There's no hotplug support for LPT and Serial on Type 2504.
35  
36  The Dock ID reads as 7 if no dock is connected.