pejakk

There is another simple way which u didn't mention: SATA to USB 3.0 adapter. Just take hard drives from both consoles and hook them up to your PC. Obviously, you need some software to make it work. You can try with FATXplorer: https://fatxplorer.eaton-works.com/. From my personal use it is the best approach to transfer all content fast without any loss and pain. You can get transfer rate about 40-80MB/s while copying things out.

Rebuild your nand with 16767 kernel, flash, install avatar update.