BIOS

Z_INFO_SERVICE_LENOVO_LEGION_5_15IMH05B_GY552_553_557_558_GY55B.RAR

BIOS / EC firmware for Lenovo 15IMH05B / GY552 / GY55B · board NM-C921 · 6.0 MB · shared in 1 Telegram post.

Download in Telegram Similar files

TXTAbout Z INFO SERVICE LENOVO LEGION 5 15IMH05B GY552 553 557 558 GY55B BIOS / EC firmware

Z INFO SERVICE LENOVO LEGION 5 15IMH05B GY552 553 557 558 GY55B is a Lenovo 15IMH05B / GY552 / GY55B BIOS / EC firmware dump for board NM-C921 (16 MB) — tested. It is packed in a RAR archive of 6.0 MB, I5 CPU. It was first posted on 22 Dec 2025 and is available in 1 Telegram channel.

Write it with an SPI programmer such as CH341A, RT809H or XGecu T48 to revive a board after a failed BIOS update, fix a corrupted Intel ME region or remove a forgotten BIOS password. Read and save the original chip first, and check that your board is NM-C921.

For the same board you can also find a boardview and a schematic — see all NM-C921 files.

Type
BIOS & EC
Format
.rar · RAR archive
Size
6.0 MB
Brand
Lenovo
Board number
NM-C921
Model
15IMH05B, GY552, GY55B
Flash size
16 MB
CPU
I5
Notes
tested
First posted
22 Dec 2025
Last posted
22 Dec 2025
Sources
1

Tags

NM-C921 BIOSNM-C921 BIOS binLenovo NM-C921Lenovo 15IMH05B BIOSLenovo 15IMH05B motherboardLenovo 15IMH05B BIOS dumpBIOS bin fileSPI flash dumpLenovo laptop BIOS binBIOS free download

MSGFrom the Telegram post

Z INFO SERVICE LENOVO LEGION 5 15IMH05B GY552-553-557-558 GY55B-55C-55F-55G GY752-753 NM-C921 REV 1.0 2020-02-14 SRH84 I5-10TH GEN 16 MB CLEAN TESTED OK DONE BIOS 100% TESTED OK BIOS

J1Download NM-C921 BIOS / EC firmware from Telegram

R1How to download Z INFO SERVICE LENOVO LEGION 5 15IMH05B GY552 553 557 558 GY55B

  1. Press Download in Telegram. The post opens in the Telegram app, or on a t.me preview page — choose “View in Telegram”.
  2. You don’t need to join the channel. Tap the file Z_INFO_SERVICE_LENOVO_LEGION_5_15IMH05B_GY552_553_557_558_GY55B.RAR to download it.
  3. Open it with 7-Zip (free) or WinRAR.

If a post was deleted, try another source above or search for NM-C921. Step-by-step help: downloading from Telegram.

Back up the original chip twice before writing this dump, and check that the board number and chip size match. See how to flash a BIOS chip.

.RARWhat is a .rar file and how to open it?

RAR archive. A compressed folder. It can hold a schematic, a boardview, a BIOS dump or all three.

Open with:

  • 7-Zip (free)
  • WinRAR

Tip: If the archive asks for a password, look for it in the Telegram post text.