FAQ
TL;DR: MEC/EC dump size is 100–200 kB; “The batch should be in the order of 100–200 kB.” This T470 CT470 NM-A931 FAQ helps technicians and owners choose safe, effective unlock paths and tools. [Elektroda, lisek, post #17516697]
Why it matters: BIOS chip swaps alone often fail because the password typically resides in the MEC/EC, not the SPI BIOS.
Quick Facts
- Board CT470 NM-A931 uses MEC1653L KBC; Intel 7th‑gen platform. [Elektroda, lisek, post #17515686]
- Typical MEC/EC dump size: approx. 100–200 kB. [Elektroda, lisek, post #17516697]
- Recommended EC tools: SVOD3 or Vertyanov JIG V3 for handling MEC access. [Elektroda, boro1234567, post #17516968]
- Service complication: MEC may be covered with black epoxy, restricting access. [Elektroda, gold-game, post #17516713]
- Repository pricing: Vinafix runs about $10 per week; availability varies. [Elektroda, Stani12, post #17518648]
Where is the BIOS password stored on a Lenovo T470 CT470 NM-A931?
On this platform, the password resides in the MEC/EC, not the SPI BIOS. “The password is not saved in the BIOS only in MECU.” EC-level work is required to clear or change it. [Elektroda, boro1234567, post #17517135]
Will flashing or replacing the SPI BIOS chip remove the T470 password?
No. Reprogramming or swapping the SPI BIOS alone will not clear the password. It is stored in the MEC/EC, not the BIOS flash. [Elektroda, boro1234567, post #17517135]
What EC/KBC controller does the CT470 NM-A931 board use?
The CT470 NM-A931 board uses a MEC1653L KBC/EC. The platform pairs with Intel 7th‑generation processors. [Elektroda, lisek, post #17515686]
What size should a correct MEC/EC dump be on this platform?
Expect about 100–200 kB for a proper MEC dump. As one expert noted, “The batch should be in the order of 100–200 kB.” Larger reads suggest a setup issue. [Elektroda, lisek, post #17516697]
I got a 1 MB MEC dump—what went wrong?
A 1 MB MEC file indicates a wrong setup or selection. Verify the layout ID and confirm the programmer is configured correctly for the EC. [Elektroda, boro1234567, post #17516642]
Which programmer works for MEC1653L on the T470?
Use EC‑capable tools. Contributors recommend SVOD3 or Vertyanov JIG V3 for handling MEC operations on this board. [Elektroda, boro1234567, post #17516968]
Can a TL866 read the MEC/EC on this board?
A user reported the TL866 could not read the MEC on this unit. This highlights compatibility limits with generic SPI programmers for EC tasks. [Elektroda, gold-game, post #17516713]
Is the MEC sometimes covered with black epoxy on T470?
Yes. One report notes the MEC is covered with black epoxy, which complicates access and increases service risk. [Elektroda, gold-game, post #17516713]
Which SPI flash chip did users find on this T470?
In this case, the secondary SPI identified was a Winbond 25Q80JV. That was the chip the user successfully dumped. [Elektroda, gold-game, post #17516672]
What SPI size do related Lenovo boards use?
On the NM-B071 (Kaby Lake-H) platform, the BIOS resides in a 25Q128JVSQ, which is a 128 Mb part. [Elektroda, lisek, post #17516697]
I don't have EC tools—can someone send a pre-programmed chip?
Yes, you can email vendors or repositories and request a pre‑programmed BIOS chip. Contributors report they were often accommodating for such requests. [Elektroda, lisek, post #17517053]
Where can I download MEC and BIOS dumps for CT470 NM-A931?
A contributor pointed to Vinafix as hosting both required dumps for this board. Access may require registration and a fee. [Elektroda, lisek, post #17517339]
How much does Vinafix access cost, and do they have NM-A931?
Reported pricing is $10 per week. Availability is not guaranteed, and they may lack NM‑A931 at times. [Elektroda, Stani12, post #17518648]
How should a professional approach an EC-locked T470?
- Confirm board ID (CT470 NM‑A931) and EC model (MEC1653L).
- Use an EC programmer like SVOD3 or Vertyanov JIG V3 to back up the MEC.
- Proceed with authorized service actions or refer to a qualified lab if tools are unavailable. [Elektroda, boro1234567, post #17516968]
Similarly 
