Need helping in unlocking underVolting on my dell hack

Hi guys

I'm trying to undervolt my laptop

Here are the specs

Dell Inspiron 5559

I3 6100u

Bios version 1.9.0

Recently unlocked

Cfg lock and increase dmvt from 32 to 64

I used modGRUBShell.efi

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i found out that setting Overclocking lock to 0x00 can help me undervolt the cpu

by default it was set to 0x01i used modGRUBShell.efi to set it to 0x00

i used this command setup_var_3 0x182 0x00

when i check the lock after reboot it shows 0x01

i used this command to check in modGRUBShell.efi setup_var_3 0x0182

here are some before and after screenshots

screenshot 1

screenshot 1
i used setup_var_3 0x182 0x00

to set overclocking lock to 0x00 from 0x01

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screenshot 2

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screenshot 2

checking the offset value of Overclocking lock after reboot

used this command to check the offset value

setup_var_3 0x0182

it was back to default 0x01 instead of 0x00

why its not saving changes

i also have extracted firmware happy to share

i used this as ref. for finding the offset for overclocking lock in my bios firmware

https://www.reddit.com/r/Dell/comments/fzv599/xps_7590_160_uefi_unlock_undervolting_and_remove/?utm_medium=android_app&utm_source=share