After flashing A new tune to your car
 

is it necessary to disconnect battery to reset ecu just after loading new tune to your car ?

No.

The ecu gets reset on every flash.

thank you guys

After every reflash just keep it for 30 seconds in IGN ON mode, then push dowb the throttle all the way slowly 2 times, then crank the engine up and leave it idle for 3 minutes without touching throttle

You re good To go then.

Disconnecting the battery after the tune will only set you back. Start the car after the flash is complete, don't touch the throttle and let the car idle for 2 minutes. Then when you drive work your way through the rev range to allow the ecu to run through the new tune.