Recently I just got 7102V and I'm satisfied. Till now I've not seen any of the previous problems like backlight, or Channel one noise yet ..., By the way I'll check more. Firmware version is 2.6.1
AFAIK it is functionally same as 2.5.1
(it is also oscilloscope product version, not exactly FW version.)
Owon display show "Version" not Firmware version if think features and user interface (UI)
Example, if something change in HW it may also affect this version number but with user eyes it is same. (service need know) Sometimes there may be manufacuring reasons for do some small component level changes but for specs or UI it do not mean anything. For end-user it is same value.
It is littlebit "confusing" but it is Owon way to do it and that's it.
I have also shortly looked version 2.7.
I have not find any functional or stability difference if look with user eyes. But in service level it mean "something".
It works just same as 2.5.1 or 2.5.1.6
(2.5.1.x.x is latest software shared by Owon as update)
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Special CH1 noise issue you can not find becouse there is not it!
This issue was solved last year! And it was only in some manufacture lots.
TFT back light control have generated some amount of noise to channels in some manufacuring lot and it is solved also. If someone get this from some seller stock, there is solution and Owon will help to remove this problem.
I will ask Owon: Why make changes to good product. Please do not make changes if all is ok.
Good example was this original TFT back light control circuit. It was good. It works ok. It can adjust also light from very dim to full. Not only numbers but also real light intensity.
What was problem/reason for make next, next and next changes. Nothing. Total lack of experience? If designer can not read some components datasheets right or understand these, what he is doing in design team? It is best to send him out for play mahjong and not gambling with designs.