It is possible to revert the firmware, but you have to have the previous version. I know we don't keep the previous versions on our website, so you may have to call 800-SAMSUNG and have product support send you the firmware. I can't handle those firmwares typically, and I don't have access to older versions that I can make available.
It's not possible to revert without a different version, however.
Is it possible to uninstall or go back to a previous version of firmware if the version you installed screwed up your picture? I installed a new firmware version for the LN-T4061F and now my screen is visible but all the colors are messed up or faded.