How Re-install same firmware

[a_m_plabon]

Please tell us some basic information before asking for help:
Model Name: Asus Zenfone Max Pro M1
Firmware Version: .082
Rooted or not: Not
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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I've 2 Max Pro M1 6GB RAM version. Both are running .082 firmware.
After update .082, one of my M1 facing hugh battery drain issue but another one run smoothly.
In this case, I want to Re-install .082 in my M1, which facing battery drain issue.
Can anyone help me to provide the way that how can I re-install the same version of firmware in my M1?

[a_m_plabon]

Dear Mod,
Can you give the procedure ?

[tusharguin29]

Updated 429 developer version then download downgrade file and downgrade your device 060 and updated step to step 082 version

[Christine_ASUS]

Hi a.m.plabon
Thank you for your asking. To perform the Factory Reset supposes to be the same thing of what you required, and it is easier! Please try "the Factory Reset" 
Settings>System>Advanced>Reset options>Erase all data(factory reset)
Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.

p.s. Sometimes the battery drain issue after firmware update might cause by some disturbance from the 3rd party apps, so that one of your phone performs well yet the other does not. And the Factory Reset is a good way to save the issue.