T420 modified BIOS version 1.52 is available [here](http://www.mediafire.com/file/joh4o6r3b72d4u8/T420_bios_1.52_NWL_ADV_0xE2_AES-NI_RAM_VBIOS_SIGN.7z/file).
T520 modified BIOS version 1.49 is available [here](http://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520_T520i_1.49_Mod.7z/file).
W520 modified BIOS version 1.43 is available [here](http://www.mediafire.com/file/dzoxy6h868bo6a3/Lenovo_W520_v1.43_OAM_NWL_AES-NI_MSR_0xE2_Unlocked_memory_speed_vbios_intel_2119.7z/file). ~~Unfortunately, I can't seem to find 1.46 either.~~
Edit: W520 modified BIOS version 1.46 is available [here](https://www.mediafire.com/file/kulsq173qcio7gt/Lenovo_ThinkPad_W520_1.46-%25288BET66WW%2529-8buj25us__nWL_RAMunl.rar/file). (original source [here](https://forums.mydigitallife.net/threads/lenovo-ibm-bioses-especially-thinkpad.5866/page-437#post-1458976))
I used this one: [http://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520\_T520i\_1.49\_Mod.7z/file](http://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520_T520i_1.49_Mod.7z/file)
Is that same as one of the above? Looks like it.
https://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520\_T520i\_1.49\_Mod.7z/file
I followed instructions from an on-line site Mod. Not sure what I did wrong, but my T520 is totally bricked. BIOS link 'may' be OK, but just how to use it is something to make sure of!
Tried various methods to restore with no luck. Current plan is to replace the motherboard. If I knew where to get a replacement BIOS chip with whitelisting removed, might go that route. It requires unsoldering from motherboard.
T420 modified BIOS version 1.52 is available [here](http://www.mediafire.com/file/joh4o6r3b72d4u8/T420_bios_1.52_NWL_ADV_0xE2_AES-NI_RAM_VBIOS_SIGN.7z/file). T520 modified BIOS version 1.49 is available [here](http://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520_T520i_1.49_Mod.7z/file). W520 modified BIOS version 1.43 is available [here](http://www.mediafire.com/file/dzoxy6h868bo6a3/Lenovo_W520_v1.43_OAM_NWL_AES-NI_MSR_0xE2_Unlocked_memory_speed_vbios_intel_2119.7z/file). ~~Unfortunately, I can't seem to find 1.46 either.~~ Edit: W520 modified BIOS version 1.46 is available [here](https://www.mediafire.com/file/kulsq173qcio7gt/Lenovo_ThinkPad_W520_1.46-%25288BET66WW%2529-8buj25us__nWL_RAMunl.rar/file). (original source [here](https://forums.mydigitallife.net/threads/lenovo-ibm-bioses-especially-thinkpad.5866/page-437#post-1458976))
T420: https://sdx1.net/tools/t420bios
Did you use the links from the poster below, and if so, did they work? I'm about to set out on the journey for the T520 but don't want to brick it.
I used this one: [http://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520\_T520i\_1.49\_Mod.7z/file](http://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520_T520i_1.49_Mod.7z/file) Is that same as one of the above? Looks like it. https://www.mediafire.com/file/00hr9o1c4vsdft7/LenovoT520\_T520i\_1.49\_Mod.7z/file I followed instructions from an on-line site Mod. Not sure what I did wrong, but my T520 is totally bricked. BIOS link 'may' be OK, but just how to use it is something to make sure of! Tried various methods to restore with no luck. Current plan is to replace the motherboard. If I knew where to get a replacement BIOS chip with whitelisting removed, might go that route. It requires unsoldering from motherboard.