If power glitches could cause unintended flash writes, what precautions would you recommend to prevent this — both from a hardware and firmware perspective?

Currently, I have about 100 µF capacitance on the 3.3 V rail for stabilization. Would increasing bulk capacitance or adding other protections ...

CONFIG_SPI_FLASH_DANGEROUS_WRITE is set to "Aborts" in my menuconfig, and I am only using standard ESP-IDF APIs for flash read/write — no low-level function calls. Given this, would it be reasonable to assume that unintended writes outside defined partitions are unlikely, or are there still ...

I reflashed the firmware on the affected device, and it is now working normally again, so it appears that the flash hardware itself is still functional.

However, I am trying to understand what could have caused the contents to be overwritten with 0x00.

The firmware partition starts at 0x10000, and ...

I am working on a product based on ESP32-U4WDH using ESP-IDF v4.4.4. We have more than 2000 devices deployed with same firmware, and recently one device failed in the field.
After retrieving the device, I found that a large region of flash had been overwritten with 0x00.

Observed Flash Corruption ...