Upgraded successfully on my device from 25.1.10 to 25.1.12 to 25.7 to 25.7.2 yesterday. n100 hw not from the major N100 vendors. A bit concerned with bootloader and successfully used the search in 25.7 series "bootloader" to use the github tool https://github.com/Emrion/uploaders. It is a safe tool to update the bootloader at this moment.