# Booting with solid white, then immediately blue led flashing mode **URL:** \ **Category:** Troubleshooting\ **Created:** [November 3, 2015, 8:29pm UTC](https://community.particle.io/t/booting-with-solid-white-then-immediately-blue-led-flashing-mode/17133 "2015-11-03T20:29:05Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![frlobo](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/frlobo/32/1279_2.png) [@frlobo](https://community.particle.io/u/frlobo)\ **Post date:** [November 3, 2015, 8:29pm UTC](https://community.particle.io/t/booting-with-solid-white-then-immediately-blue-led-flashing-mode/17133/1 "2015-11-03T20:29:05Z")
What does that means? I have been having trouble with this device for a long time with strange behaviors… It’s the one referred to here: [Is my photon dead?](https://community.particle.io/t/is-my-photon-dead/16374/31) I left it this time reporting weather connected directly to the power outlet and disabled all sleep functions (including deep sleep) (using an adapter of course), and then suddenly stopped reporting… I found it off… with no lights… I rebooted and it now goes from a solid white after the reset button is pressed to a flashing blue in normal pace. Any idea what that means? ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [November 3, 2015, 8:39pm UTC](https://community.particle.io/t/booting-with-solid-white-then-immediately-blue-led-flashing-mode/17133/2 "2015-11-03T20:39:38Z")
Just by your descriptioin I’d guess your device has lost the WiFi credentials. This is the same behaviour as if you had called `WiFi.clearCredentials()` or held down SETUP for more than 10sec without RESET. Try entering the WiFi credentials again. ---
**Author:** ![frlobo](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/frlobo/32/1279_2.png) [@frlobo](https://community.particle.io/u/frlobo)\ **Post date:** [November 3, 2015, 8:43pm UTC](https://community.particle.io/t/booting-with-solid-white-then-immediately-blue-led-flashing-mode/17133/3 "2015-11-03T20:43:46Z")
Why does this happen?? I didn’t called that mode or pressed that button? How can I know if this photon is the cause of trouble? The code it’s running it’s very straight forward… And it’s different from the old one that was giving me trouble… Is there a diagnostic routine I can call to check the health of the memory, etc? ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [November 3, 2015, 8:46pm UTC](https://community.particle.io/t/booting-with-solid-white-then-immediately-blue-led-flashing-mode/17133/4 "2015-11-03T20:46:50Z")
This might have to do with this issue [https://github.com/spark/firmware/issues/704](https://github.com/spark/firmware/issues/704) There is some discussion going on about it, so you might have to stay tuned on the issue ---
**Author:** ![frlobo](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/frlobo/32/1279_2.png) [@frlobo](https://community.particle.io/u/frlobo)\ **Post date:** [November 4, 2015, 7:33am UTC](https://community.particle.io/t/booting-with-solid-white-then-immediately-blue-led-flashing-mode/17133/5 "2015-11-04T07:33:44Z")
It appears to be related… Il standby… ---
**Author:** ![frlobo](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/frlobo/32/1279_2.png) [@frlobo](https://community.particle.io/u/frlobo)\ **Post date:** [December 10, 2015, 7:56am UTC](https://community.particle.io/t/booting-with-solid-white-then-immediately-blue-led-flashing-mode/17133/6 "2015-12-10T07:56:22Z")
For ref. See this post for possible solution: > [@'EEPROM' persistence issue](https://community.particle.io/t/eeprom-persistence-issue/16514/39): > > The brown-out reset (BOR) functionality is off by default on the STM32. You can see that the first time you run the code below. Those that have the EEPROM persistence issue can try this code to set the brown-out level to a higher value to see if it makes the issue go away. The BOR feature will keep the microcontroller in reset when the voltage is too low. @nicodegunst your code above didn’t actually change the BOR level because it was missing the unlock and launch steps. Can you try this? #in…