How to reduce sleep current in nrf21540DK

Hello, I am using the peripheral_lbs example project and build it for nrf21540dk_nrf21540

I also added CONFIG_SERIAL=n, CONFIG_UART_CONSOLE=n for disabling uart.

But still i couldn't able to get <=3uA sleep current.

Do i have to enable/disable something to get sleep current??

I measured power consumption by following steps as instructed in nordic documentation:

1. Cut SB40 bridge

2.provided connection acc. to the diagram

3.Set the ppk to ampere meter mode and enabled the power output

I even tried in both nRF only and Default modes (toggle switch in DK), but still couldn't see any much difference.

What should be done to get <=3uA sleep current in nrf21540DK??

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