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The 'basicConfig' for logging can be modified even after it is already established by using the following steps:

1. Import the logging module:

import logging

1. Get the existing logger instance:

logger = logging.getLogger()

1. Set the new configuration using logger.setLevel() and logger.addHandler(). For example:

logger.setLevel(logging.DEBUG)
handler = logging.StreamHandler(sys.stdout)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)

1. The new configuration will be applied to all logging statements made using the logger instance.

Note: It is recommended to modify the basicConfig as early as possible in the application's code to ensure all logging statements are made using the desired configuration.