If you explain how, I can dump as soon as my HDS272S arrives.
Are you able to modify such firmwares? I would really like my HDS to be able to generate a PWM signal which according to the manual is not implemented by Owon.
If you have never worked with arm controllers, recommend to practice first on a cheap development board (e.g. stm32f103c8t6), because if something goes wrong, you can get a brick.
Assuming that HDS272S got the same architecture as Hantek 2D72,
the easiest way to make dump is to use ST-Link V2:
1. Download ST-Link Utility
2. Connect ST-Link V2 to software debug ports on main circuit board (GND, SW_CLK, SW_DAT)
3. In ST-LINK Utility, specify Address: 0x08000000, with the size : 0x80000
4. Connect to Target, or press enter
5. Click save file button (File should be 512kB)
There will be an opportunity to try disassemble *.hex file.
But it is quite difficult to modify such firmwares (without source code).
Sometimes it's even easier to write custom firmware anew.
For me, like probably for many others, it is interesting to check firmware interchangeability between series Hantek 2000 and Owon HDS200.