How to flash bootloader to thingy 52?

[Gova]

I am a newbie for Nordic development boards. I recently bought a thingy 52. When I was searching for how to upload a custom firmware of my own (After disabling few BLE services), I came across this link. OTA-DFU - Generating your own packages

I have installed nrfutil and have generated Private key. But how am I supposed to flash the bootloader? I have only one thingy board in hand.

Once I have my ZIP file, I can do a OTA-DFU with my phone. But please let me know how to flash the bootloader onto the board over the air.

I would be glad if someone can help me. Thanks a ton in advance.

[Gova]

Thank you so much for your reply. Yes with the attached images, I think i need a nRF DK to program the bootloader.

[Bjørn Kvaale]

@Daniel Wang I do not think this will work, as Secure DFU is needed to be able to upload custom FW to the Nordic Thingy:52. It is possible to use OTA-DFU with the Nordic Thingy FW (e.g. using the iOS or Android Thingy app) or via an nrf51/52 DK & SWD cable between P19 & the Thingy SWD connector to the right of the USB port on the Thingy:52. An open bootloader option is being considered in the future for custom FW, but currently you have to use secure DFU for this. See my updated answer above for a great blog post to read.