I have a strange obsession with the STM8 microcontroller. Arguably because it’s so cheap (you could get in in bulk from <0,40€ per piece or for 0,60€ on a dev-board), but powerful and versatile at the same time, due to:
lots of GPIOs UART/SPI/I2C/ADC low power proper interrupts works both at 3.3V and 5V When investigating radio communication for some hobby projects a few years I stumbled upon the HC-12 module which easily adds wireless serial communication to your project. Read More...
As part of my HC-12 hacking project I needed to acquire the firmware of an STM8 microcontroller that had readout protection enabled.
I was long-time intrigued by fault-injection attacks, most recently triggered by this 35C3 Talk on PS2 Vita Hacking which used voltage glitching to overcome protection measures.
From the STM8 reference manual:
4.5.1: Readout protection
Readout protection is selected by programming the ROP option byte to 0xAA. When readout protection is enabled, reading or modifying the Flash program memory and DATA area [using the SWIM debug interface] is forbidden. Read More...
After rooting the Viomi V2, the question arises whether it’s safe to perform a firmware update. So we look at the filesystem diff and some of the binaries.
New in 3.5.3_0045 Looking at the diff comparing 0045 with the 0044 firmware, we see some minor changes to the base system.
Looking at the changes in RobotApp we can infer changed features:
new properties around lifetime of filter, brush or mop multimap management clean preferences management probably some improvements in area cleaning / navigation probably some work on dynamic obstacle detection (like doors) So performing the update to 0045 should be safe and preserve your root access. Read More...
