Mark of bleprofile_SendConnParamUpdateReq, impact?

There is a slow speed via OTA with BrCM 20737s chip with Samsung handsets even if we 

add in Ws_upgrade_ota.c

            // to make upgrade faster request host to reduce connection interval to minimum
            lel2cap_sendConnParamUpdateReq(6, 6, 0, 700);

but it doesnt work and ota speed near 20min.

However if we mark this line below in encryption_changed(HCI_EVT_HDR *evt)() in  hello_sensor.c

    // We are done with initial settings, and need to stay connected.  It is a good
    // time to slow down the pace of master polls to save power.  Following request asks
    // host to setup polling every 100-500 msec, with link supervision timeout 7 seconds.
    //bleprofile_SendConnParamUpdateReq(80, 400, 0, 700);

it can work with only 2min ota. However, we disable a refered speed from slave to master...

is it impact any issue for instance, master auto set a interval speed but slave can not support it to cause link-drop or other issue???