Hi Richard,
I¡¯m glad I wasn¡¯t the first to point out that this mistake isn¡¯t called a ¡°brick¡±. Stop causing panic, because in his position, when not in use, this will not happen unless he has dropped and broken his display or walked on with his car. Then you can say it's a brick.
It appears from your description that you downloaded a 4 "version firmware for the 2.8" version. This is not good! This is a bad choice.
It¡¯s good to have a ST-Link v2 hardware, but put that aside for now.
My first question is, what exactly did you do? He found it wasn't working.
What to do: First, make sure that the device battery is not exhausted.
If discharged first recharge and then turn on when it works: glad.
If it doesn't work and your battery is charged, I have an additional question:
Have you ever tried to use your device while connected to your computer?
You can connect to the computer via a COM port using a driver, in which case the device is visible in the device manager.
Possible in DFU (i.e. Device Firmware Upgrade) mode where it is NOT VISIBLE between COM ports.
In this mode, it is possible to upload (or download) the operating firmware to the device's microprocessor.
You can do this by uploading a .dfu file using DfuSe.
Before I write about a lot of things here, please read the article Using NanoVNA on my website.
There is a lot of help here. If reading these doesn¡¯t help, ask where you got stuck.
Please don¡¯t give up on someone whose solution is unknown, in despair. But this is not the case. There is help.
The 2.8 "-H device would require the installation of the DiSlord 1.0.45 firmware, which is the current latest.
If you have switched the device to DFU mode and do not log in in the solo mode after the firmware has been loaded, it will still remain in DFU mode.
That is, dfu must be loaded until it logs in after on / off.
73, Gyula HA3HZ
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*** If you are not part of the solution, then you are the problem. ( ) ***
Gyula Molnar