I have a V2 +4 that is not working for measuring VSWR on VHF/UHF. It works fine on HF. It also won't do a firmware update, it gets a white screen when holding down the left button when booting up. It also will not connect to a PC, it doesn't show up as a com port, even with the win10 driver installed.

Any ideas if this might be reset/fixed somehow? Or is it just borked?

try a different cable.. maybe it's just a charge cable?? or does not make good
contact??

in normal mode or in bootloader mode it should be found as a comport!!!

white screen is normal if switched to bootloader mode

dg9bfc Sigi





Am 04.10.2025 00:50 schrieb Jonathan Peakall <jpeakall@madlabs.info>:

>

> I have a V2 +4 that is not working for measuring VSWR on VHF/UHF. It
works fine on HF. It also won't do a firmware update, it gets a white screen
when holding down the left button when booting up. It also will not connect to
a PC, it doesn't show up as a com port, even with the win10 driver installed.

>

> Any ideas if this might be reset/fixed somehow? Or is it just borked?



_._,_._,_

* * *

Make sure your cal standards are good and try doing a reset in the cal menu before doing the calibration on vhf? I was getting lots of very strange results on my SV4401a till I figured that out. It's basically a Nano with a big screen and N sockets.

Cheers,

Colin.

Did all that. No joy.

On 10/4/2025 12:20 PM, Colin via groups.io wrote:

> Make sure your cal standards are good and try doing a reset in the cal
> menu before doing the calibration on vhf? I was getting lots of very
> strange results on my SV4401a till I figured that out. It's basically
> a Nano with a big screen and N sockets.
> Cheers,
> Colin.
>

How about a factory reset, and/or a firmware upgrade or reload?

Beyond that, I'm afraid it's terra incognito to me - anything that works past UHF, or made in the last 5 years, is just witchcraft!

Good luck,

Colin.

I've been looking for how to do a factory reset but can only see how to
do that through a PC. Which I can't seem to connect to. Is there any
other way?

On 10/6/2025 6:49 AM, Colin via groups.io wrote:

> How about a factory reset, and/or a firmware upgrade or reload?
> Beyond that, I'm afraid it's terra incognito to me - anything that
> works past UHF, or made in the last 5 years, is just witchcraft!
> Good luck,
> Colin.
>