Hey, this was found in the Thinkpad 13 Chromebook repair manual pg. 22 (https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/tp13chrome_hmm_en_sp40j47620.pdf)[br]
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To remove the write-protect screw, do the following: [br]
1. Disable the battery. See “Disabling the battery” on page 48. [br]
2. Disconnect the Lenovo USB-C 45W AC Adapter and all cables from the computer, and then remove the keyboard. See “1010 Keyboard” on page 48. [br]
3. Remove the base cover assembly. See “1020 Base cover assembly” on page 54. [br]
4. Remove the wireless LAN card. See “1030 Wireless LAN card” on page 56. [br]
5. Remove the battery. See “1040 Battery” on page 56. [br]
6. Remove the USB support bracket. See “1080 USB support bracket ” on page 59. [br]
7. Remove the thermal fan. See “1090 Thermal fan assembly” on page 60. [br]
8. Remove the system board. See “1110 System board” on page 62. [br]
9. Turn over the system board and then locate the write-protect screw on the system board as shown in the following illustration. To turn off the write-protect function, remove the write-protect screw. [br]
[image|2956853]
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10. After you have removed the write-protect screw, reassemble the computer. Reconnect the Lenovo USB-C 45W AC Adapter and all cables. [br]
11. To turn on the write-protect function, follow the previous steps to locate the hole for the write-protect screw and reinstall the screw. Then reassemble your computer and reconnect the cables.