GATT Error 133 nrf52840 dk

[amarin]

Hi,

I am currently trying to create a bootloader for a project I am working on. I am familiarizing myself with the dfu and bootloader modules by running one of the example codes in my sdk(v15.2.0). I was able to compile and run the code smoothly and was even able to transfer the zip file from my phone via nrfConnect. However, once the nrf52840 rebooted, I kept on getting the error seen in the screenshot. If someone can please help me in trying to fix this, I would greatly appreciate it!

Thanks!!

[Hung Bui]

Hi Amarin,

Please try capture a sniffer trace so we know what happened over the air. Please make sure you follow the connection and can see the communication between the phone and the device. 

Error 133 is a generic error and it can be many reasons that cause the issue. 
Do you see the same issue on other phones ? 

You mentioned that when the device rebooted you saw the issue. When exactly in the DFU process your device rebooted ? 
If you try with just the bootloader, can you do a successful DFU update ?  

[amarin]

This morning I got the same error and started to debug. It turns out that after I was able to successfully update the DFU, although I still had a GATT error, by rescanning for my peripherals, I rescanned my peripherals and found the BLE code I had uploaded (in this case it was the Nordic_Blinky example) as a separate BLE module.