[REQUEST] Dell Inspiron 7548 BIOS UNLOCK

[isosa28]

Hi mate,
This 1st Option is here :

0x1FF19 Form: Switchable Graphics, Form ID: 0x2812 {01 86 12 28 3C 0A}
0x1FF1F Grayout If: {19 82}
0x1FF21 Variable 0x2F3 equals 0x4 {12 86 F3 02 04 00}
0x1FF27 Not {17 02}
0x1FF29 End {29 02}
0x1FF2B Setting: SG Mode Select, Variable: 0x4A2 {05 91 3E 0A 3F 0A C5 02 01 00 A2 04 10 10 02 02 00}
0x1FF3C Option: Muxless, Value: 0x2 (default) {09 07 40 0A 10 00 02}
0x1FF43 End of Options {29 02}
0x1FF45 End If {29 02}
0x1FF47 Suppress If: {0A 82}
0x1FF49 Variable 0x2F3 equals 0x4 {12 86 F3 02 04 00}
0x1FF4F Not {17 02}
0x1FF51 Variable 0x595 equals 0x0 {12 06 95 05 00 00}
0x1FF57 Or {16 02}
0x1FF59 End {29 02}
0x1FF5B Setting: PX 5.0 Mode, Variable: 0x4A3 {05 91 45 0A 46 0A C6 02 01 00 A3 04 10 10 00 01 00}
0x1FF6C Option: BACO Mode, Value: 0x0 {09 07 47 0A 00 00 00}
0x1FF73 Option: dGPU Power off, Value: 0x1 (default) {09 07 48 0A 10 00 01}
0x1FF7A End of Options {29 02}
0x1FF7C End If {29 02}
0x1FF7E End Form {29 02}

all connected !

So to change this Wecan make It in two ways :

1. Change the Control Variable 0x2F3 value to 0x04 It will show all Graphics Option
2. Change any single Graphics Variable 0x4A2 (Default 0x02 MuxLess) so It can be 0x01 too but brick !

Setting: SG Mode Select, Variable: 0x4A2 {05 91 3E 0A 3F 0A C5 02 01 00 A2 04 10 10 02 02 00}
0x1FF3C Option: Muxless, Value: 0x2 (default) {09 07 40 0A 10 00 02}

I thinks 0x01 = Muxed there ins't as HW doesn't Permit !!!
You need Schematics to check this.

Then again for all your request so for this two We will these commands :

1. setup_var 0x02F3 0x04
2. setup_var 0x04A2 0x01 (But probably switch of sceen aoutput and Black Screen)

0x1FF5B Setting: PX 5.0 Mode, Variable: 0x4A3 {05 91 45 0A 46 0A C6 02 01 00 A3 04 10 10 00 01 00}
0x1FF6C Option: BACO Mode, Value: 0x0 {09 07 47 0A 00 00 00}
0x1FF73 Option: dGPU Power off, Value: 0x1 (default) {09 07 48 0A 10 00 01}

setup_var 0x04A3 0x00

As Option: dGPU Power off, Value: 0x1 (default) {09 07 48 0A 10 00 01} is default value and You can change
I think You get Black Screen !

Then We can continue . . .
let me know
Regards

I get setup_var is not recognized as an internal command.
If I type setvar it tells me I cannot change to 0x04.

[isosa28]

Hello,
When I did setup_var 0x02F3 0x04 I get this message and nothing shows in the bios.

Guid does not match expected Guid, taking it nevertheless expected a diferrent size of the setup variable.
offset 0x2F3 is: 0x00
setting offset 0x2F3 to 0x04

[BDMaster]

I understand mate !
Then I cannot help You !
I am sorry !
Try to ask to CodeRush as He is an AMI Bios Developer and may be can do more
than me
Regards

[shane.w010@gmail.com]

Hello,
When I did setup_var 0x02F3 0x04 I get this message and nothing shows in the bios.

Guid does not match expected Guid, taking it nevertheless expected a diferrent size of the setup variable.
offset 0x2F3 is: 0x00
setting offset 0x2F3 to 0x04

I saw a guide to this on another site somewhere; 

on tony mac x86 go to /yosemite-laptop-support/162062-guide-intel-hd-graphics-5500-os-x-yosemite-10-10-3-a.html


Intel HD graphics 5500 DVMT memory allocation mod to 96mb I think

. BTW, ISOSA28 I am following your online guide for "maccing" up my inspiron 7548 UHD model....hopeful for the end result lol.

I put the EFI shell required for this in the attachments:

unzip it then copy "BOOT" and its contents to root directory of formatted USB and boot from it then use the "set_var" command. :-)