Never share your otp.bin or seeprom.bin files. Because they contain your console's unique keys and serial number, sharing them can lead to your account being banned from online services.
If your Wii U boots normally, the safest and easiest method is to run a software-based backup via a Custom Firmware environment like Aroma or Tiramisu. Insert your Wii U-formatted SD card into your PC.
# For external SPI flash containing both dd if=/dev/mtd0 of=otp_backup.bin bs=1k count=64 dd if=/dev/mtd1 of=seeprom_backup.bin bs=1k count=128 otp.bin seeprom.bin
OTP memory is a form of non-volatile programmable read-only memory (PROM).
is a sector-by-sector image of this OTP region. Common sizes include 256 bytes, 1KB, or 4KB. This file contains data that is fused into the silicon during manufacturing. Never share your otp
: Unique identifiers for the CPU and other internal components.
To understand why you often see otp.bin and seeprom.bin together, consider a typical secure boot sequence: Insert your Wii U-formatted SD card into your PC
Cemu Online Functionality Not Working on Linux, but ... - GitHub