Device bricks after OTA firmware upgrade

RE: Device bricks after OTA firmware upgrade

Stian Røed Hafskjold — Tue, 03 Jan 2017 14:56:24 GMT

Hi, yes you're right that unstopped timers may cause problems. The documentations on older SDK versions are not updated very often unfortunately. I agree that we need a better system for reporting bugs. This is fixed in SDK 12 though.

RE: Device bricks after OTA firmware upgrade

NG — Sat, 31 Dec 2016 23:18:40 GMT

Hi All, Possibly found the reason for the bricking during OTA DFU - it is related to having an unstopped timer prior to jumping to bootloader, seethis. This is SUPER annoying! Why Nordic did you not document this properly? How is it that you have a function not return in the library code?

RE: Device bricks after OTA firmware upgrade

NG — Fri, 23 Dec 2016 23:13:42 GMT

Hi Stian, I've recently migrated to SDK10, and I am now again having a problem with DFU. The DFU completes successfully, however, when main() is re-entered, the device pauses and never returns from: nrf_drv_timer_extended_compare (in app_pwm_init).

nrf_drv_timer_extended_compare(p_instance->p_timer, (nrf_timer_cc_channel_t) PWM_MAIN_CC_CHANNEL,
                                ticks, NRF_TIMER_SHORT_COMPARE2_CLEAR_MASK, true);

RE: Device bricks after OTA firmware upgrade

NG — Wed, 16 Nov 2016 22:55:03 GMT

Hi Stian, Also, what I found is that even though SDK8.1 is reported to have bugs in the PWM implementation, and it is recommended to upgrade to SDK10 - I find that replacing the app_pwm.c/h files with the SDK10 versions works fine when flashing the device via a cable, but bricks the device during OTA DFU.

RE: Device bricks after OTA firmware upgrade

NG — Wed, 16 Nov 2016 05:58:32 GMT

Hi Stian, since posting my question, I've found that I could prevent the device bricking after OTA firmware update by adjusting system_reset_prepare(). My application uses two PWM channels. I found that adding "app_pwm_disable(&PWM1); app_pwm_disable(&PWM2);" to system_reset_prepare() fixed the bricking. This fixed the problem, but I do not understand why. Please help?

RE: Device bricks after OTA firmware upgrade

Stian Røed Hafskjold — Mon, 14 Nov 2016 12:11:10 GMT

This is not supposed to happen. If the firmware update is successful, the device should restart into the new application. Are you able to provide any code or hex-files so I can try to reproduce it here?

RE: Device bricks after OTA firmware upgrade

phnikola — Sun, 13 Nov 2016 16:18:31 GMT

Hi, exactly same problem... bricked by mobile app... What a dangerous thing... Accessing unpaired wristband can be done by nRF mobile phone app and can attack anyone in surrounding.. :(

RE: Device bricks after OTA firmware upgrade

vasanth — Mon, 29 Aug 2016 02:08:20 GMT

I had a same issue.. After DFU from mobile app. it is not at all detecting