Here was my process
1.) Format a USB flash drive to FAT32
2.) Load the flash drive with the
SDS1004X-E Firmware (4-Channel Model) - 6.1.25R2 (Release Date 06.29.18) by
downloading it from the Siglent website and unzipping it onto the flashdrive.
3.) Once the file is loaded, install the firmware onto the oscilloscope by following the instructions in the PDF included in the firmware zip file. Verify the correct firmware version is installed using the menus within the Utility button, and take note of the model number (should read SDS1104X-E)
4.) Once the firmware has been installed on the scope, reformat the flash drive to FAT32 and unzip the
SDS1004X-E Operating System-V1 (Only For 4-Channel ) (Release Date 06.26.18) after
downloading it from the Siglent website.
5.) Install the software update onto the oscilloscope by following the instructions in the PDF included in the firmware zip file. Reboot the scope and verify the correct software version is installed using the menus within the Utility button.
6.)
Download the custom operating system file that possesses the known telnet password. Unzip it onto a USB drive and install it just as you installed the stock software file from the Siglent website. NOTE: Some computers do not correctly load the software file onto the USB drive, thus preventing the scope from updating from the stock software to the custom software. I have experienced this problem personally. If this occurs, try loading it onto the USB from a different computer. I had success using a Raspberry Pi to load the custom software onto the USB.
7.) After installing the custom software, plug the oscilloscope into your router with an ethernet cable, and telnet into the scope on
port 23 using the known password.
8.) Once in the scope via telnet, execute the following commands:
mount -o remount,rw ubi2_0 /usr/bin/siglent/firmdata0
cd /usr/bin/siglent/firmdata0
mv bandwidth.txt bandwidth.bak
9.) Reboot the scope, and verify that the model number displayed in the Utility button menus has been updated to show an SDS
1204X-E
Now the scope should have 200MHz bandwidth. I have verified that mine possesses this bandwidth using a very reliable, stable signal generator (Fluke 6061A)
EDIT: Thanks ian.ameline for the link to a download source for the custom software. I have updated step 6 with this information.