You need to change the firmware using the patched Odin 3.13.1Can you give me the exact instructions ti flash it using the alliance x app. I tried both renaming it to update.zip and just leaving it as a bin file anf both start to flash and then stop at 20-30% with the error message.
You have to be on the specific firmware FIRST before you can update to One UI 4.0.
So for instance, my phone is SM-G998W, if I flash the SM-G998U1 firmware linked in this thread, it will fail, I MUST be on SM-G998U1 FIRST before I can flash the update. So I need to use the patched Odin to go from W to U1, once I am on the U1 firmware with the latest update (4AUH9), then I can update to One UI 4.0
That is your first step, flash the correct firmware needed first using Odin, then you can update.