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# Adafruit nRF52 Bootloader w/ Enhanced OTA DFU
The purpose of this fork is to include a few additions/fixes to the bootloader BLE OTA code for NRF52840 based devices which I've noticed around github.
The purpose of this fork is to change the behaviour of the bootloader in OTA DFU mode. When the bootloader *detects* an invalid application firmware after an OTA update it will boot back to OTA DFU mode. This isn't totally bulletproof but if your device is difficult to access then this is a lot better than the default behaviour which is to boot into UF2/CDC mode on detection of an invalid application firmware.
Additionally HCI_RX_BUF_QUEUE_SIZE is increased from 8 to 16. This is almost a necessity for OTA updates work on nRF52850 boards, otherwise a buffer overflow and crash in the bootloader is almost guaranteed.
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#### Boards: