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LENOVO Thinkpad X1 Yoga 4th Gen FX490 NM-B861 REV 1.0 (Type 20QF, 20QG)

Laptops and Desktop Bios, Schematic and Boardview Files And Repairing Discussion
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ThinkpadX1 Yoga 4th Gen (Type 20QF, 20QG) FX490 NM-B861 REV 1.0
FX490 NM-B861 (REV 1.0) Schematic
FX490 NM-B861 (REV 1.0) Boardview.cad
 
About this board

This thread is for the Thinkpad X1 Yoga 4th Gen FX490 (Type 20QF 20QG) with main board NM-B861.

Lenovo had this board built by LCFC; LCFC (Lenovo/Compal) board numbers start with NM-. Check the number printed on the PCB before you download. Board revision: 1.0. Match the revision as well as the board number.

From the title: Intel 4th gen platform.

Files usually needed for this board
  • BIOS (full SPI chip dump, .bin)
  • EC / KBC firmware, if the board uses a separate EC chip
  • Schematic (PDF)
  • Boardview (.brd / .bdv / .cad)

Common cases: dead board after an interrupted BIOS update, ME region errors, missing serial number or UUID after a board swap, or a password lock.

Back up the original dump first — it contains machine-specific data (serial, UUID, MAC, ME), and you will want it if anything goes wrong.

If you have a working file for this board, please share it below. More files: search NM-B861 in File Finder.

Attachments

FX490 NM-B861 (REV 1.0).pdf
18.7 MB · Views: 52
Last edited by a moderator:
Click to expand...
THINKPAD X1 Yoga 4th Gen NM-B861 BIOS
CLEAN ME BIOS
BIOS VER N2HET78W
EC MEC1663 FIRMWARE 288KB
SRF9W (Intel Core i7-8665U)
TESTED IMRANROMI

....................................................................​

ThinkPad X1 Carbon 7th Gen NM-B861
CLEAN ME BIOS
SRF9Z (Intel Core i5-8365U)
BIOS VER N2HET80W
TESTED IMRANROMI
 

Attachments

MEC YOGA X1 4TH mod 288kb.BIN
288 KB · Views: 10
Last edited:
X1 Yoga 4th Gen (Type 20QF, 20QG) Laptop (ThinkPad) - Type 20QG
NM-B861
CLEAN ME BIOS 32MB
BIOS VER N2HET78W
SRFFX (Intel Core i5-8265U)
FACTORY IMAGE
TESTED IMRANROMI
............................................................................................................................
X1 Yoga 4th Gen (Type 20QF, 20QG) Laptop (ThinkPad) - Type 20QG
NM-B861
CLEAN ME BIOS 32MB
BIOS VER N2HET83W
SRF9W (Intel Core i7-8665U)
FACTORY IMAGE
TESTED IMRANROMI
 

Attachments

Last edited:
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