The setting lives in Settings, Graphics, Frame Rate. Whether the 90 FPS option appears at all depends on your phone, and whether you should use it depends on something most guides skip entirely: can your device hold it for a whole match?

Where the setting is

Open BGMI and tap the settings icon, bottom right of the lobby.
Go to Graphics.
Set Graphics to Smooth. Higher presets lock out the top frame rates.
Under Frame Rate, choose the highest option shown.

If 90 FPS is not listed, that is the answer: your device is not on the supported list for it, and no setting inside the game will add it.

Two things have to be true

Your screen must refresh at 90 Hz or above. A 60 Hz panel physically cannot display 90 distinct frames per second. Most budget phones are 60 Hz or 90 Hz; 120 Hz is common on mid-range and up.

The game must whitelist your device. BGMI gates high frame rates per model rather than exposing them everywhere. This is why two phones with similar specifications can offer different maximums.

This is the reason to avoid "90 FPS unlock" config files and GFX tools. If the option is absent, the hardware or the whitelist is the constraint. A modified file does not change either, and using one risks your account.

Whether you actually want it

Here is the part the settings guides leave out. Running at 90 asks the processor for roughly 50 percent more frames per second than 60. That means more heat, and heat means thermal throttling.

On a phone that cannot sustain it, the result is not 90 FPS. It is a frame rate that starts near 90, falls into the 50s after ten minutes, and swings while it does. Inconsistent frame timing feels worse than a lower steady number, because your aim adapts to a rhythm that keeps changing.

What you observe over a full match	What to set
Holds close to 90 throughout	Keep 90
Starts at 90, settles in the 60s	Cap at 60 for consistency
Starts at 90, falls below 50	Cap at 40 or 60 and fix cooling
Phone is hot to touch within 10 minutes	Lower the cap and take the case off

How to test it in one match

Set 90, play a full match, and watch the frame rate at the start and again near the end. What matters is the gap between those two numbers, not the peak. A phone that reads 88 at minute two and 54 at minute eighteen is telling you it cannot hold 90.

Battery matters too. High frame rates drain noticeably faster, which is a fair trade in ranked and a poor one for casual play.

If you cannot get 90

A stable 60 with Smooth graphics and shadows off will beat an unstable 90 in almost every fight. Spend the effort on the settings that actually cost frames and on keeping the phone cool, rather than chasing a number your hardware was never going to hold.