Adding this content here is to improve the user’s development efficiency and avoid stepping into known problems.
V3.1 updated the bootloader to initialize SPI flash I/O mode and clock. So if you are using the V3.0 bootloader, and now upgrade to the new SDK, please disable the following configuration in the menuconfig:
"Bootloader config ---> [ ] Bootloader init SPI flash"
We split the native OTA example into several sub-examples to let custemors to choose which application matches the scenario they really want. examples/system/ota/native_ota.