KE8CPD,
I have the same NanoVNA (Black without shields) as you and also just upgraded to version 0.2.3. I'm pretty sure all version 0.2.3 firmware have the battery icon which I don't see on your photos. I upgraded using hugen's official release at . My NanoVNA came with the two trace software and I wanted to upgrade to four trace. The previous advice, when upgrading from two trace to four trace, was to load "CLEAR_MEMORY_DFU.dfu" first and then load the four trace software. Hugen says that is not necessary with his 0.2.3 release. In any event, if you use his release and things don't look right after calibration, ensure that "Correction" is highlighted under the "Cal" menu.
Herb
