API call to flash tinker?

[rickkas7]

You should use enterSafeMode from the device. See

Verify a "Good" Firmware Update - User Code

This is not a feature of Device OS, but you could add a feature to your user firmware fairly easily. You store a flag and a counter in EEPROM or the file system. It could be in retained memory on Gen 3 and earlier, but that won't work right for this code on Gen 4 (P2, Photon 2, M-SoM). You clear the successful boot flag at the very beginning of setup, and set it sometime later from loop, like 3 minutes after boot. You can use the millis() counter to check, which resets to 0 on system reset. Al…