[REQUEST] Lenovo IdeaPad S145-15API (BUCNxxWW) BIOS Unlock

[lucsus]

Hello.

I have an s145-api (81v70000br) from Lenovo and really stressed with the impossibility ti change uma framer buffer size. I have 8gb ram and the bios are allocation 2gb to vram, wich I don't really use (tested on normal conditions and it's using 0,5gb max), leaving me with 5,7gb ram only. It is absolutely ridiculous that I can't change this on settings.

Could you pleeeease help me? Thank you very much. 

Bios download link:
https://download.lenovo.com/consumer/mobiles/bucn23ww.exe
Found on this page age:
https://pcsupport.lenovo.com/br/en/produ...s/ds540493

[dima333750]

I have the same laptop and the same problem, it's sad. I tried it for a long time, but I could not flash the modified bios. installed protection "ERROR 234 - SecureFlash verification fail!"
I have uploaded my files here https://drive.google.com/file/d/16u2gwuy...sp=sharing

I am an amateur, I perform all operations on my own.
After opening the bios, I found lines like this:

0x16991 Setting: UMA Frame buffer Size, Variable: 0xD4 {05 9A 0E 02 0F 02 93 00 00 50 D4 00 10 12 40 00 00 00 FF FF FF FF 00 00 00 00}
0x169AB Option: Auto, Value: 0x0 {09 0A 0F 00 12 02 FF FF FF FF}
0x169B5 Option: 64M, Value: 0x0 {09 0A 10 02 02 02 40 00 00 00}
0x169BF Option: 128M, Value: 0x0 {09 0A 11 02 02 02 80 00 00 00}
0x169C9 Option: 256M, Value: 0x0 {09 0A 12 02 02 02 00 01 00 00}
0x169D3 Option: 384M, Value: 0x0 {09 0A 13 02 02 02 80 01 00 00}
0x169DD Option: 512M, Value: 0x0 {09 0A 14 02 02 02 00 02 00 00}
0x169E7 Option: 80M, Value: 0x0 {09 0A 15 02 02 02 50 00 00 00}
0x169F1 Option: 96M, Value: 0x0 {09 0A 16 02 02 02 60 00 00 00}
0x169FB Option: 768M, Value: 0x0 {09 0A 17 02 02 02 00 03 00 00}
0x16A05 Option: 1G, Value: 0x0 {09 0A 18 02 02 02 00 04 00 00}
0x16A0F Option: 2G, Value: 0x0 {09 0A 19 02 02 02 00 08 00 00}
0x16A19 Option: 3G, Value: 0x0 {09 0A 1A 02 02 02 00 0C 00 00}
0x16A23 Option: 4G, Value: 0x0 {09 0A 1B 02 02 02 00 10 00 00}
0x16A2D Option: 8G, Value: 0x0 {09 0A 1C 02 02 02 00 20 00 00}
0x16A37 Option: 16G, Value: 0x0 {09 0A 1D 02 02 02 00 40 00 00}

I tried using setup_var from bootx64.efi, although it is not clear which value to specify, but I could not even read the value. So at startup
setup_var 0x4D
I received an "error: offset is out of range"
So I decided to edit the bios hex with an editor based on the values:
FF FF FF FF - auto
40 00 00 00 - 64
80 00 00 00 - 128, etc.
I found line 09 0A 0F 00 12 02 FF FF FF FF in the hex editor and replaced 09 0A 0F 00 12 02 40 00 00 00, it might be a catastrophic error!
But I could not flash the bios "ERROR 234 - SecureFlash verification fail!"

[andras888]

I have the almost same laptop and the same problem.
S145-15API 81UT0042HV
Newest Bios: https://download.lenovo.com/consumer/mob...cn27ww.exe
Thenks!

[Tamil464]

I BUY EXP GDC FOR MY LAPTOP BUT BIOS NOT ALLOW TO BOOT WITH UNAUTHORIZED DEVICE SO I NEED MODED BIOD 

BIOS BACKUP LINK https://www.sendspace.com/file/njq2r7

ORIGINAL BIOS FROM OFFICIAL SITE LINK https://pcsupport.lenovo.com/in/en/produ...IOS%2FUEFI

[GioCap]

I BUY EXP GDC FOR MY LAPTOP BUT BIOS NOT ALLOW TO BOOT WITH UNAUTHORIZED DEVICE SO I NEED MODED BIOD 

 
BIOS BACKUP LINK https://www.sendspace.com/file/njq2r7

ORIGINAL BIOS FROM OFFICIAL SITE LINK https://pcsupport.lenovo.com/in/en/produ...IOS%2FUEFI

Hi guy, use this tool, run it as Admin and ulpload the result file :

https://www.mediafire.com/file/hi7la6ln3...r2.7z/file

Let me know
Regards

[Dudu2002]

I BUY EXP GDC FOR MY LAPTOP BUT BIOS NOT ALLOW TO BOOT WITH UNAUTHORIZED DEVICE SO I NEED MODED BIOD 

 
BIOS BACKUP LINK https://www.sendspace.com/file/njq2r7

ORIGINAL BIOS FROM OFFICIAL SITE LINK https://pcsupport.lenovo.com/in/en/produ...IOS%2FUEFI

Hi
AMD cpu!
Bios mod can be flashed using SPI-programmer+SOIC8 clip only

[Rendum]

Hello, I have a similar laptop s145-15api 81ut007frk, please unlock the advanced menu. Thanks https://www.sendspace.com/file/63hb38