[Request] Pegatron C15B BIOS unlock / TDP limit mod

BIOS/UEFI Modding BIOS Modding Requests
1

I replaced my laptop’s i5-4210m (37W) cpu with an i7-4800mq (47W). However, an unexpected problem was that the BIOS was locked to 37W. Whenever the new cpu tried to exceed 37W and reach 47W, the motherboard immediately cut the voltage.

System Information:

  • Laptop Model: Pegatron C15B (OEM)

  • CPU: Intel Core i7-4800MQ

  • GPU: Nvidia GeForce 840M (2GB, soldered)

  • BIOS Vendor: AMI Aptio IV (bios chip: Winbond W25Q16BV)

  • BIOS Version: v703 (latest, from manufacturer website: BIOS File)

  • BIOS Lock Status: currently locked (no advanced options visible)

Changes I Want:

  • Unlock TDP / PL1–PL2 Power Limits from 37W to 47–57W (currently locked to 37 W)

  • Current Limit / ICCMAX unlock /Remove Power/EDP Current Throttling limits

  • Thermal Throttling thresholds (Trip Points)

  • Unlock Advanced/Power/Overclock tabs & Advanced Menu Visibility

  • Fan Control tab unlock (if exists)

My goal:

  • allow full performance of i7-4800MQ (47 W) and better thermal tuning.

  • Power adapter upgraded to 150–180 W.

  • Cooling system modified.

  • I’m aware of the risks (I’m going to buy CH341A programmer + clip).

  • I can reflash BIOS if necessary.

Please help with an unlocked or modded BIOS that removes the 37W power cap and allows full control of PL1/PL2 or TDP settings.

Ekran görüntüsü 2025-10-08 015132
Ekran görüntüsü 2025-10-08 015132412×409 16 KB

bios version
bios version441×464 51.4 KB

2

I don’t think it’s easy, but I’d rather use this computer as a mini PC than have it be e-waste.

3

Gentlemens, if this service has a cost for you, please PM me.

I can arrange it, I’m ok wit that.

4

I opened the BIOS with the AMIBCP.

Should I select USER or SUPERVISOR in the visibility section to see that setting in the BIOS?

5

Some will accept both, some one or another.
Test a simple string visibility, not whatever you may think you want/need, flash to test results then advance further, you should have full backups and know how to recover a “bad” bios mod/test.

EDIT: Only parent main menu’s first and then only the substring inside, if necessary, because usually when unlocking the main category, by default will show the related ones… if i do recall correctly.

1 Like
7

Thanks for your reply.

First, I’ll change only visibility of advanced settings for users on bios interface and flash the BIOS.

If that doesn’t make any problem, then I’ll start adjusting the TDP settings as well.

I ordered the CH341A programmer + clip and I am waiting for it to arrive. I’ll be prepared, just in case.