HANTEK DSO4072C - Bypassing software limitation
Introduction
Doing electronics is fun, but expensive. Therefor when I have had to buy an oscilloscope, I went for a entry price unit and got myself a HANTEK DSO4072C
https://www.hantek.fr/oscilloscopes-de-table/28-hantek-dso4072c-oscilloscope-2-canaux-70mhz-et-generateur-awg.htmlThe HANTEK DSO4072C digital oscilloscope is a good value, but more importantly, it is hackable !
HANTEK is producing the same board for every versions of the DSO4XXX oscilloscopes. Therefor the only limitation of the bandwidth is pur software. After searching online, I found several tutorials on how to hack the software of theses devices
Hacking the scope
Step 1 : Open the oscilloscope
There are several screws on the oscilloscope that has to be removed
There is another layer of protection, here are the screws locations
Step 2 : Finding the Serial pins
In order to communicate with the device, we need to find the Serial pins on which we will be able to connect our USB/UART adapter
Here is the label of each pins
Step 3 : connect the USB/UART
Open MobaXterm and open a serial session with the above configuration
Speed (Bps) : 115200
Data bytes : 8
Stop bits : 1
Parity : noneThen power up the scope, here is the result in the serial terminal
Press enter and there should be the following prompte shown
Step 4 : Edit the config file
In the newly obtained shell, type the following commandes to first backup the file that will be modified
# Create a local backup of the config file
cp i2c.log i2c.log.bkpTo hack the bandwidth all you need to do is to edit one file in DSO root directory
vi i2c.log
# Edit the line [bw]
[bw] 70 to [bw] 200Step 5 : Apply the edit
then use commande to reboot the device
rebootthe new bandwidth will be available.
Step 6 : Checking the modification
Opening the menu Utility -> System Info you should see the model changed to DSO4202C.
Sources