kdf Same problem here on a 4xl. Any fix soon ?
I don't speak for the GrapheneOS project, but personally I wouldn't bet on a quick resolution -- or on the certainty of any resolution -- for the 4XL. All 4XL releases since early November 2022 have been using vulnerable unsupported firmware, and all releases since September 2023 have been described by the project as "shouldn't be used anymore".
I don't know how the GrapheneOS developers decide how much time to allocate to EOL devices, but it would make sense if less developer time were allocated as a device is EOL for longer.
With the release of the 9 series, it seems likely that the 8 and 7 devices will see price drops. A used device in good condition might be a good avenue forward if the price of a new device is unwelcome. Alternatively, the DivestOS project focuses more on longevity than on security, so they might support 4 XL devices for longer than GrapheneOS.