Regarding firmware upgrades, the only one that I know of is the one that incorporates BS/RDR. If you don't have the latest firmware on your RD, it will have to be sent into Escort for the upgrade.
If a further firmware upgrade is offered sometime in the future, you can either send it in to Escort, or if you own an Escort Live SmartCord, you can upload the firmware to the cord using Detector Tools and then it will update the firmware in the RedLine.
I'd like to expand on the previous comment that 'Laser doesn't really matter'. For best Laser detection, your RL should be mounted low, and for best Radar detection, it should be mounted high. This is because LEOs using Laser are aiming them at your headlamps or license plate. I take the previous poster's comment to mean that if you get a laser alert, and you aren't using any other Laser counter-measures, then the LEOs already have your speed, and the alert doesn't amount to much more than to let you know that you're toast.
To counter Laser, you'll need to install Laser shifters/jammers, and perhaps a apply a coating of Laser Veil on your headlamps and license plate.
Good luck