Need help in UV vdd

Anyone who can help me out in undervolting the vdd? Here's my code for vdd.
Whenever I try to lower the value of voltage by subtracting a small integer eg. 4, the vdd's dont correctly apply and it shows "VDD set failed" in dmesg. But raising of voltage works..

I think there is some minimum limit of voltage required that's why its not going down. Any way I can lower that limit somehow? Or can I do something so that users can reduce the voltage? Any workarounds for that?


EDIT: Mission succesful :D