In the early days of Rushmore audio, I was always told and read that ideally the flash is done prior to the installation of any aftermarket gear. Guess that's water under the bridge now since the upgrade is done.
Besides finding an independent to do it, the only other solution I can think of is to pull the AMP, line leveler and aftermarket front speakers, then take it to a dealership and tell them you're adding a pair of HD OEM fairing speakers up front and need fader / balance control. Get the flash done and then reinstall everything.
If you're unlucky like me, and live in part of the country where you don't have access to an Indy with the right equipment, you might be able to reach out to one of the Audio sellers here and inquire about sending your head unit in for the right flash.
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