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How to change the system voltage using wrmsr in Intel i5, 64 bit system?

SP_H_
Beginner
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We figured out the voltage by multiplying the value we obtained using the command sudo rdmsr 0x198 --bitfield 47:32 with (1 / 2^13). But when we tried to change the value of 0x198  we got the following error

wrmsr: CPU 0 cannot set MSR 0x00000198 to "value"

 

 

But we are not able to figure out how to change the value using sudo wrmsr? Which register should be changed? We disabled the Intel Speed step technology in BIOS.

 

Any help will be appreciated

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