~/xx20-thinkpad-patched-bios-archive $ cd ~ Enter
auto blog projects git misc contacts

x220_v1.46_modified_bios.zip 11.37 MiB

t420-bios-sdx1.zip 8.22 MiB

t420s_8cuj20us_8cet61ww_1.41_nwl_0xe2_aes-ni_ramsp_adv_vbios-2170.zip 7.78 MiB

lenovot520_t520i_1.49_mod.7z 6.09 MiB

lenovo_w520_v1.43_oam_nwl_aes-ni_msr_0xe2_unlocked_memory_speed_vbios_intel_2119.7z 6.12 MiB

Thanks to Discord ThinkPad community for providing the files.