WARNING: Never load an _OTA.bin into a probe with the legacy bootloader (every probe with firmware v5.x, and v6.x probes that were moved from v5.x over the air): the old bootloader writes the compressed file as it is, and the probe does not start again - only a programmer brings it back.
Every KMK179 with firmware v6.x has the A/B bootloader; a KMK179 with the legacy firmware gets its first v6.x firmware with a programmer. Update with abcZ 4.2.0 (probeformeters.com, the product page: abcZ - Software Download).

KMK179 firmware v6.4 290926 - the KMK179 standard image (the mode switch selects the working mode).

KMK179_WF52_N70221134_v6.4_290926_OTA.bin   the staged update over Wi-Fi with abcZ

abcZ shows the bootloader on the Overview page. User manual, chapter 10 (Firmware Update): https://probeformeters.com/en/manuals/kmk179-wifi-optical-probe-user-manual
