Firmware Dongle v10

Dongle firmware v10

Released	2026-05
Status	Superseded by v14
Pairs with receiver	v15+
Predecessor	v9
Notable	First release with OTA flash support.

Downloads

File	Purpose	Download
os4_dongle_v10.bin	App partition.	Download
os4_dongle_v10.bootloader.bin	Chip bootloader.	Download
os4_dongle_v10.partitions.bin	Partition table.	Download
os4_dongle_v10.boot_app0.bin	OTA "next-app" pointer.	Download

Release notes

OTA flash mode (paired with receiver FW v15+).

• New serial commands flash_begin / flash_data / flash_end / flash_abort drive an end-to-end firmware push from the host to a single chosen receiver. While in flash mode the dongle pins itself to that one receiver: regular polling and command-queue dispatch are paused, and the radio data rate is hopped up to RF24_2MBPS to keep the ~340 KB transfer under ~30 seconds end-to-end.
• Each flash_data <chunkIdx> <hex_payload> line emits a single OTA_DATA frame and reports back ota_ack / ota_nack JSON so the host can pace the next chunk on success or retry on failure.
• After flash_end the dongle waits up to 30 s for the receiver to reboot back onto the standard 250 kbps poll, then reports ota_done (or ota_timeout) before resuming normal operation.

Upgrade notes

• Mandatory upgrade if you want OTA on receivers — paired with receiver v15+.
• No breaking change for normal show flow; pre-v15 receivers continue to work with this dongle exactly as they did with v9.

How to flash

• Flashing a dongle.