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The problem with expansion on newer devices is due to limitations. Some manufacturers leave very little space in the Super partition, almost to the limit, especially if it's an ERofs partition, since when you want to compile the new super.img file, it requires almost 2GB or more of space that you must free up for compilation. The solution is in how we convert from ERofs to ext4 and how much space to allocate to the new partitions. Many things are updated every year, so the methods and libraries must also be updated. Although Ro2rw hasn't been updated in a long time, it's incredible that it still works on many devices. But if you investigate the Google documentation about erofs ,ext4 and its bookstores, you can find the solution to your problem.