RE: nrf54lm20a OTA fail

john.liu — Mon, 10 Aug 2026 12:28:30 GMT

Hi Sigurd:

Thanks for your help!

I have made the modifications, but there are still issues.

I: OTA_RECEIVING: msg_type=0x04
I: Chunk rx_seq=0 (expect=0) len=63 received=0/254036
I: DFU header
I: 3d b8 f3 96 00 00 00 00 |=.......
I: 00 08 00 00 84 d7 03 00 |........
I: First chunk: data_len=63
E: Missing stream_buf, call '..set_buf' before '..init
E: dfu_target_init failed: -19

				LOG_HEXDUMP_INF(&pkt->data[3],
						MIN(data_len, 16),
						"DFU header");
				LOG_INF("First chunk: data_len=%u", data_len);

				/*
				 * TODO: uncomment when flash writes are
				 * enabled:
				 */
				enum dfu_target_image_type type;
				type = dfu_target_img_type(&pkt->data[3],
										data_len);
				err = dfu_target_init(type, 0,
										total_size, NULL);
				if (err) {
					LOG_ERR("dfu_target_init failed: %d", err);
					ota_reset();
					return;
				}

RE: nrf54lm20a OTA fail

Sigurd — Mon, 10 Aug 2026 08:58:49 GMT

Hi!

Try this:

Add to the application's prj.conf:

CONFIG_DFU_TARGET=y
CONFIG_DFU_TARGET_MCUBOOT=y

CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_STREAM_FLASH=y
CONFIG_IMG_MANAGER=y
CONFIG_MCUBOOT_IMG_MANAGER=y

And in sysbuild.conf:

SB_CONFIG_BOOTLOADER_MCUBOOT=y