R1CBU runs on top of the base software.? You need to download and install R1CBU to and SD card and boot from the SD card.? R1CBU does not over-write the stock firmware.? Unplug the SD card and you are back to stock firmware.? I run SSB and FT8 on R1CBU. There are several YT videos on R1CBU.? Watch a few.? To me, it's superior to the stock firmware and it is still being actively updated by the community.
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